1620521505201 has 16 divisors (see below), whose sum is σ = 2221811222400. Its totient is φ = 1049990110080.

The previous prime is 1620521505199. The next prime is 1620521505209. The reversal of 1620521505201 is 1025051250261.

It is not a de Polignac number, because 1620521505201 - 2¹ = 1620521505199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620521505209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25015126 + ... + 25079823.

It is an arithmetic number, because the mean of its divisors is an integer number (138863201400).

Almost surely, 2^{1620521505201} is an apocalyptic number.

It is an amenable number.

1620521505201 is a deficient number, since it is larger than the sum of its proper divisors (601289717199).

1620521505201 is a wasteful number, since it uses less digits than its factorization.

1620521505201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50095256.

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 1620521505201 its reverse (1025051250261), we get a palindrome (2645572755462).

The spelling of 1620521505201 in words is "one trillion, six hundred twenty billion, five hundred twenty-one million, five hundred five thousand, two hundred one".