10531344978 has 64 divisors (see below), whose sum is σ = 29177763840. Its totient is φ = 2735413200.

The previous prime is 10531344961. The next prime is 10531344979. The reversal of 10531344978 is 87944313501.

10531344978 is a `hidden beast` number, since 1 + 0 + 531 + 3 + 4 + 49 + 78 = 666.

It is a super-2 number, since 2×10531344978² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10531344979) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1262238 + ... + 1270553.

It is an arithmetic number, because the mean of its divisors is an integer number (455902560).

Almost surely, 2^10531344978 is an apocalyptic number.

10531344978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

10531344978 is an abundant number, since it is smaller than the sum of its proper divisors (18646418862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10531344978 is a wasteful number, since it uses less digits than its factorization.

10531344978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532820 (or 2532814 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 10531344978 in words is "ten billion, five hundred thirty-one million, three hundred forty-four thousand, nine hundred seventy-eight".