665131054851 has 32 divisors (see below), whose sum is σ = 987383232000. Its totient is φ = 442519572384.

The previous prime is 665131054807. The next prime is 665131054853. The reversal of 665131054851 is 158450131566.

It is a happy number.

665131054851 is a `hidden beast` number, since 6 + 6 + 51 + 3 + 1 + 0 + 548 + 51 = 666.

It is not a de Polignac number, because 665131054851 - 2²⁷ = 664996837123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665131054797 and 665131054806.

It is not an unprimeable number, because it can be changed into a prime (665131054853) 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, 48510985 + ... + 48524693.

It is an arithmetic number, because the mean of its divisors is an integer number (30855726000).

Almost surely, 2^665131054851 is an apocalyptic number.

665131054851 is a deficient number, since it is larger than the sum of its proper divisors (322252177149).

665131054851 is a wasteful number, since it uses less digits than its factorization.

665131054851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17240 (or 17234 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 665131054851 in words is "six hundred sixty-five billion, one hundred thirty-one million, fifty-four thousand, eight hundred fifty-one".