1551729664 has 33 divisors (see below), whose sum is σ = 3104465871. Its totient is φ = 775234560.

The previous prime is 1551729653. The next prime is 1551729671. The reversal of 1551729664 is 4669271551.

The square root of 1551729664 is 39392.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1259929 + ... + 1261159.

Almost surely, 2^1551729664 is an apocalyptic number.

1551729664 is the 39392-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551729664

1551729664 is an abundant number, since it is smaller than the sum of its proper divisors (1552736207).

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

1551729664 is an frugal number, since it uses more digits than its factorization.

1551729664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482 (or 1233 counting only the distinct ones).

The product of its digits is 453600, while the sum is 46.

The cubic root of 1551729664 is about 1157.7248469527.

It can be divided in two parts, 155172 and 9664, that added together give a square (164836 = 406²).

The spelling of 1551729664 in words is "one billion, five hundred fifty-one million, seven hundred twenty-nine thousand, six hundred sixty-four".