1620016401 has 8 divisors (see below), whose sum is σ = 2163820320. Its totient is φ = 1078111712.

The previous prime is 1620016397. The next prime is 1620016417. The reversal of 1620016401 is 1046100261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620016401 - 2² = 1620016397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620016421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472815 + ... + 476228.

It is an arithmetic number, because the mean of its divisors is an integer number (270477540).

Almost surely, 2^1620016401 is an apocalyptic number.

It is an amenable number.

1620016401 is a deficient number, since it is larger than the sum of its proper divisors (543803919).

1620016401 is an equidigital number, since it uses as much as digits as its factorization.

1620016401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949615.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1620016401 is about 40249.4273375411. The cubic root of 1620016401 is about 1174.4642557783.

Adding to 1620016401 its reverse (1046100261), we get a palindrome (2666116662).

The spelling of 1620016401 in words is "one billion, six hundred twenty million, sixteen thousand, four hundred one".