312505345656 has 48 divisors (see below), whose sum is σ = 967278452400. Its totient is φ = 89287241472.

The previous prime is 312505345627. The next prime is 312505345667. The reversal of 312505345656 is 656543505213.

312505345656 is a `hidden beast` number, since 3 + 1 + 2 + 50 + 5 + 34 + 565 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310024641 + ... + 310025648.

It is an arithmetic number, because the mean of its divisors is an integer number (20151634425).

Almost surely, 2^312505345656 is an apocalyptic number.

312505345656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

312505345656 is an abundant number, since it is smaller than the sum of its proper divisors (654773106744).

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

312505345656 is a wasteful number, since it uses less digits than its factorization.

312505345656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620050308 (or 620050301 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 45.

The spelling of 312505345656 in words is "three hundred twelve billion, five hundred five million, three hundred forty-five thousand, six hundred fifty-six".