1553774664 has 32 divisors (see below), whose sum is σ = 4183240320. Its totient is φ = 478084416.

The previous prime is 1553774639. The next prime is 1553774693. The reversal of 1553774664 is 4664773551.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2489712 + ... + 2490335.

It is an arithmetic number, because the mean of its divisors is an integer number (130726260).

Almost surely, 2^1553774664 is an apocalyptic number.

It is an amenable number.

1553774664 is an abundant number, since it is smaller than the sum of its proper divisors (2629465656).

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

1553774664 is a wasteful number, since it uses less digits than its factorization.

1553774664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4980069 (or 4980065 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 48.

The square root of 1553774664 is about 39417.9485006513. The cubic root of 1553774664 is about 1158.2332061247.

The spelling of 1553774664 in words is "one billion, five hundred fifty-three million, seven hundred seventy-four thousand, six hundred sixty-four".