2660431356 has 108 divisors (see below), whose sum is σ = 7443345000. Its totient is φ = 800585280.

The previous prime is 2660431351. The next prime is 2660431391. The reversal of 2660431356 is 6531340662.

2660431356 is a `hidden beast` number, since 266 + 0 + 43 + 1 + 356 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2660431356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660431351) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 646995 + ... + 651093.

Almost surely, 2^2660431356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2660431356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3721672500).

2660431356 is an abundant number, since it is smaller than the sum of its proper divisors (4782913644).

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

2660431356 is a wasteful number, since it uses less digits than its factorization.

2660431356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280 (or 4264 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 2660431356 is about 51579.3694804425. The cubic root of 2660431356 is about 1385.6408744534.

The spelling of 2660431356 in words is "two billion, six hundred sixty million, four hundred thirty-one thousand, three hundred fifty-six".