16657204431 has 16 divisors (see below), whose sum is σ = 25703705600. Its totient is φ = 9397915488.

The previous prime is 16657204427. The next prime is 16657204477. The reversal of 16657204431 is 13440275661.

It is a happy number.

It is not a de Polignac number, because 16657204431 - 2² = 16657204427 is a prime.

It is a super-2 number, since 2×16657204431² (a number of 21 digits) contains 22 as substring.

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 16657204431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16657200431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5018596 + ... + 5021913.

It is an arithmetic number, because the mean of its divisors is an integer number (1606481600).

Almost surely, 2^16657204431 is an apocalyptic number.

16657204431 is a deficient number, since it is larger than the sum of its proper divisors (9046501169).

16657204431 is a wasteful number, since it uses less digits than its factorization.

16657204431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10040598.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 16657204431 in words is "sixteen billion, six hundred fifty-seven million, two hundred four thousand, four hundred thirty-one".