1391927463656 has 8 divisors (see below), whose sum is σ = 2609863994370. Its totient is φ = 695963731824.

The previous prime is 1391927463601. The next prime is 1391927463701. The reversal of 1391927463656 is 6563647291931.

It can be written as a sum of positive squares in only one way, i.e., 1389253539556 + 2673924100 = 1178666^2 + 51710^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86995466471 + ... + 86995466486.

Almost surely, 2^{1391927463656} is an apocalyptic number.

It is an amenable number.

1391927463656 is a deficient number, since it is larger than the sum of its proper divisors (1217936530714).

1391927463656 is a wasteful number, since it uses less digits than its factorization.

1391927463656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173990932963 (or 173990932959 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 62.

The spelling of 1391927463656 in words is "one trillion, three hundred ninety-one billion, nine hundred twenty-seven million, four hundred sixty-three thousand, six hundred fifty-six".