16620598025 has 12 divisors (see below), whose sum is σ = 20891866332. Its totient is φ = 13114333440.

The previous prime is 16620598021. The next prime is 16620598073. The reversal of 16620598025 is 52089502661.

It can be written as a sum of positive squares in 6 ways, for example, as 353891344 + 16266706681 = 18812^2 + 127541^2 .

It is not a de Polignac number, because 16620598025 - 2² = 16620598021 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16620598021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4551764 + ... + 4555413.

It is an arithmetic number, because the mean of its divisors is an integer number (1740988861).

Almost surely, 2^16620598025 is an apocalyptic number.

It is an amenable number.

16620598025 is a deficient number, since it is larger than the sum of its proper divisors (4271268307).

16620598025 is an equidigital number, since it uses as much as digits as its factorization.

16620598025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9107260 (or 9107255 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 16620598025 in words is "sixteen billion, six hundred twenty million, five hundred ninety-eight thousand, twenty-five".