123257212947 has 96 divisors (see below), whose sum is σ = 214511431680. Its totient is φ = 69896286720.

The previous prime is 123257212931. The next prime is 123257212987. The reversal of 123257212947 is 749212752321.

123257212947 is a `hidden beast` number, since 1 + 2 + 32 + 572 + 1 + 2 + 9 + 47 = 666.

It is not a de Polignac number, because 123257212947 - 2⁴ = 123257212931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123257212907) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7853454 + ... + 7869132.

It is an arithmetic number, because the mean of its divisors is an integer number (2234494080).

Almost surely, 2^123257212947 is an apocalyptic number.

123257212947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

123257212947 is a deficient number, since it is larger than the sum of its proper divisors (91254218733).

123257212947 is a wasteful number, since it uses less digits than its factorization.

123257212947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15895 (or 15883 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 123257212947 in words is "one hundred twenty-three billion, two hundred fifty-seven million, two hundred twelve thousand, nine hundred forty-seven".