10644997631 has 4 divisors (see below), whose sum is σ = 10659520872. Its totient is φ = 10630474392.

The previous prime is 10644997591. The next prime is 10644997639. The reversal of 10644997631 is 13679944601.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10644997631 - 2¹⁴ = 10644981247 is a prime.

It is a super-2 number, since 2×10644997631² (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 10644997631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10644997639) 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, 7260521 + ... + 7261986.

It is an arithmetic number, because the mean of its divisors is an integer number (2664880218).

Almost surely, 2^10644997631 is an apocalyptic number.

10644997631 is a deficient number, since it is larger than the sum of its proper divisors (14523241).

10644997631 is an equidigital number, since it uses as much as digits as its factorization.

10644997631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14523240.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 10644997631 in words is "ten billion, six hundred forty-four million, nine hundred ninety-seven thousand, six hundred thirty-one".