16721460631 has 4 divisors (see below), whose sum is σ = 16877736072. Its totient is φ = 16565185192.

The previous prime is 16721460629. The next prime is 16721460641. The reversal of 16721460631 is 13606412761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13606412761 = 112291 ⋅121171.

It is a cyclic number.

It is not a de Polignac number, because 16721460631 - 2¹ = 16721460629 is a prime.

It is a super-2 number, since 2×16721460631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721460641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78137560 + ... + 78137773.

It is an arithmetic number, because the mean of its divisors is an integer number (4219434018).

Almost surely, 2^16721460631 is an apocalyptic number.

16721460631 is a deficient number, since it is larger than the sum of its proper divisors (156275441).

16721460631 is a wasteful number, since it uses less digits than its factorization.

16721460631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156275440.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 16721460631 in words is "sixteen billion, seven hundred twenty-one million, four hundred sixty thousand, six hundred thirty-one".