16207321657 has 8 divisors (see below), whose sum is σ = 17271818496. Its totient is φ = 15172810752.

The previous prime is 16207321643. The next prime is 16207321673. The reversal of 16207321657 is 75612370261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16207321657 - 2²⁷ = 16073103929 is a prime.

It is a super-2 number, since 2×16207321657² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16207321687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7495368 + ... + 7497529.

It is an arithmetic number, because the mean of its divisors is an integer number (2158977312).

Almost surely, 2^16207321657 is an apocalyptic number.

It is an amenable number.

16207321657 is a deficient number, since it is larger than the sum of its proper divisors (1064496839).

16207321657 is a wasteful number, since it uses less digits than its factorization.

16207321657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992967.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 16207321657 in words is "sixteen billion, two hundred seven million, three hundred twenty-one thousand, six hundred fifty-seven".