202020251601 has 8 divisors (see below), whose sum is σ = 307840383424. Its totient is φ = 115440143760.

The previous prime is 202020251591. The next prime is 202020251603. The reversal of 202020251601 is 106152020202.

It is a happy number.

202020251601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202020251601 - 2⁷ = 202020251473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 9620011981 = 202020251601 / (2 + 0 + 2 + 0 + 2 + 0 + 2 + 5 + 1 + 6 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (202020251603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4810005970 + ... + 4810006011.

It is an arithmetic number, because the mean of its divisors is an integer number (38480047928).

Almost surely, 2^202020251601 is an apocalyptic number.

202020251601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202020251601 is a deficient number, since it is larger than the sum of its proper divisors (105820131823).

202020251601 is an equidigital number, since it uses as much as digits as its factorization.

202020251601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9620011991.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 202020251601 its reverse (106152020202), we get a palindrome (308172271803).

The spelling of 202020251601 in words is "two hundred two billion, twenty million, two hundred fifty-one thousand, six hundred one".