1377564656 has 20 divisors (see below), whose sum is σ = 2874342072. Its totient is φ = 635798976.

The previous prime is 1377564653. The next prime is 1377564659. The reversal of 1377564656 is 6564657731.

It is an interprime number because it is at equal distance from previous prime (1377564653) and next prime (1377564659).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377564653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3311246 + ... + 3311661.

Almost surely, 2^1377564656 is an apocalyptic number.

1377564656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1377564656 is an abundant number, since it is smaller than the sum of its proper divisors (1496777416).

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

1377564656 is a wasteful number, since it uses less digits than its factorization.

1377564656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622928 (or 6622922 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 50.

The square root of 1377564656 is about 37115.5581394110. The cubic root of 1377564656 is about 1112.6809787801.

The spelling of 1377564656 in words is "one billion, three hundred seventy-seven million, five hundred sixty-four thousand, six hundred fifty-six".