1551660651600 has 120 divisors (see below), whose sum is σ = 4971288826080. Its totient is φ = 413709365760.

The previous prime is 1551660651581. The next prime is 1551660651721. The reversal of 1551660651600 is 61560661551.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7565607 + ... + 7767993.

It is an arithmetic number, because the mean of its divisors is an integer number (41427406884).

Almost surely, 2^{1551660651600} is an apocalyptic number.

1551660651600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551660651600 is an abundant number, since it is smaller than the sum of its proper divisors (3419628174480).

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

1551660651600 is a wasteful number, since it uses less digits than its factorization.

1551660651600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208797 (or 208786 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 1551660651600 in words is "one trillion, five hundred fifty-one billion, six hundred sixty million, six hundred fifty-one thousand, six hundred".