16545661607425 has 12 divisors (see below), whose sum is σ = 20565353471356. Its totient is φ = 13205088590400.

The previous prime is 16545661607399. The next prime is 16545661607429. The reversal of 16545661607425 is 52470616654561.

It can be written as a sum of positive squares in 6 ways, for example, as 1332611654544 + 15213049952881 = 1154388^2 + 3900391^2 .

It is not a de Polignac number, because 16545661607425 - 2⁹ = 16545661606913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16545661607425.

It is not an unprimeable number, because it can be changed into a prime (16545661607429) 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, 786006654 + ... + 786027703.

Almost surely, 2^{16545661607425} is an apocalyptic number.

It is an amenable number.

16545661607425 is a deficient number, since it is larger than the sum of its proper divisors (4019691863931).

16545661607425 is a wasteful number, since it uses less digits than its factorization.

16545661607425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572034788 (or 1572034783 counting only the distinct ones).

The product of its (nonzero) digits is 36288000, while the sum is 58.

The spelling of 16545661607425 in words is "sixteen trillion, five hundred forty-five billion, six hundred sixty-one million, six hundred seven thousand, four hundred twenty-five".