16403907557 has 2 divisors, whose sum is σ = 16403907558. Its totient is φ = 16403907556.

The previous prime is 16403907551. The next prime is 16403907577. The reversal of 16403907557 is 75570930461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15001105441 + 1402802116 = 122479^2 + 37454^2 .

It is a cyclic number.

It is not a de Polignac number, because 16403907557 - 2¹⁸ = 16403645413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16403907551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8201953778 + 8201953779.

It is an arithmetic number, because the mean of its divisors is an integer number (8201953779).

Almost surely, 2^16403907557 is an apocalyptic number.

It is an amenable number.

16403907557 is a deficient number, since it is larger than the sum of its proper divisors (1).

16403907557 is an equidigital number, since it uses as much as digits as its factorization.

16403907557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 793800, while the sum is 47.

The spelling of 16403907557 in words is "sixteen billion, four hundred three million, nine hundred seven thousand, five hundred fifty-seven".