16661252403 has 24 divisors (see below), whose sum is σ = 25085632208. Its totient is φ = 10645981632.

The previous prime is 16661252389. The next prime is 16661252429. The reversal of 16661252403 is 30425216661.

It is not a de Polignac number, because 16661252403 - 2⁸ = 16661252147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661252603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351076 + ... + 395697.

Almost surely, 2^16661252403 is an apocalyptic number.

16661252403 is a deficient number, since it is larger than the sum of its proper divisors (8424379805).

16661252403 is a wasteful number, since it uses less digits than its factorization.

16661252403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746883 (or 746880 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 16661252403 in words is "sixteen billion, six hundred sixty-one million, two hundred fifty-two thousand, four hundred three".