16628540325 has 24 divisors (see below), whose sum is σ = 27501531456. Its totient is φ = 8865648000.

The previous prime is 16628540309. The next prime is 16628540389. The reversal of 16628540325 is 52304582661.

It is not a de Polignac number, because 16628540325 - 2⁴ = 16628540309 is a prime.

It is a super-2 number, since 2×16628540325² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204585 + ... + 274065.

It is an arithmetic number, because the mean of its divisors is an integer number (1145897144).

Almost surely, 2^16628540325 is an apocalyptic number.

16628540325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16628540325 is a deficient number, since it is larger than the sum of its proper divisors (10872991131).

16628540325 is a wasteful number, since it uses less digits than its factorization.

16628540325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72685 (or 72680 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 16628540325 in words is "sixteen billion, six hundred twenty-eight million, five hundred forty thousand, three hundred twenty-five".