631256705145 has 24 divisors (see below), whose sum is σ = 1193649043392. Its totient is φ = 306063856800.

The previous prime is 631256705119. The next prime is 631256705207. The reversal of 631256705145 is 541507652136.

631256705145 is a `hidden beast` number, since 6 + 3 + 12 + 56 + 70 + 514 + 5 = 666.

It is not a de Polignac number, because 631256705145 - 2⁷ = 631256705017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 631256705145.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 637632541 + ... + 637633530.

It is an arithmetic number, because the mean of its divisors is an integer number (49735376808).

Almost surely, 2^631256705145 is an apocalyptic number.

It is an amenable number.

631256705145 is a deficient number, since it is larger than the sum of its proper divisors (562392338247).

631256705145 is a wasteful number, since it uses less digits than its factorization.

631256705145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275266093 (or 1275266090 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 631256705145 in words is "six hundred thirty-one billion, two hundred fifty-six million, seven hundred five thousand, one hundred forty-five".