16653621607 has 16 divisors (see below), whose sum is σ = 19421498880. Its totient is φ = 13984597152.

The previous prime is 16653621587. The next prime is 16653621629. The reversal of 16653621607 is 70612635661.

It is a cyclic number.

It is not a de Polignac number, because 16653621607 - 2²³ = 16645232999 is a prime.

It is a super-2 number, since 2×16653621607² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16653621007) 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, 52198 + ... + 189820.

It is an arithmetic number, because the mean of its divisors is an integer number (1213843680).

Almost surely, 2^16653621607 is an apocalyptic number.

16653621607 is a deficient number, since it is larger than the sum of its proper divisors (2767877273).

16653621607 is a wasteful number, since it uses less digits than its factorization.

16653621607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137982.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 16653621607 in words is "sixteen billion, six hundred fifty-three million, six hundred twenty-one thousand, six hundred seven".