1551640564 has 12 divisors (see below), whose sum is σ = 2716293888. Its totient is φ = 775556600.

The previous prime is 1551640511. The next prime is 1551640579. The reversal of 1551640564 is 4650461551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52372 + ... + 76459.

It is an arithmetic number, because the mean of its divisors is an integer number (226357824).

Almost surely, 2^1551640564 is an apocalyptic number.

It is an amenable number.

1551640564 is a deficient number, since it is larger than the sum of its proper divisors (1164653324).

1551640564 is a wasteful number, since it uses less digits than its factorization.

1551640564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131846 (or 131844 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 1551640564 is about 39390.8690434725. The cubic root of 1551640564 is about 1157.7026877539.

The spelling of 1551640564 in words is "one billion, five hundred fifty-one million, six hundred forty thousand, five hundred sixty-four".