1551115510656 has 64 divisors (see below), whose sum is σ = 4141722240000. Its totient is φ = 514331471360.

The previous prime is 1551115510621. The next prime is 1551115510667. The reversal of 1551115510656 is 6560155111551.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent 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, 10500906 + ... + 10647593.

It is an arithmetic number, because the mean of its divisors is an integer number (64714410000).

Almost surely, 2^{1551115510656} is an apocalyptic number.

1551115510656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1551115510656 is an abundant number, since it is smaller than the sum of its proper divisors (2590606729344).

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

1551115510656 is a wasteful number, since it uses less digits than its factorization.

1551115510656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21148707 (or 21148695 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 42.

The spelling of 1551115510656 in words is "one trillion, five hundred fifty-one billion, one hundred fifteen million, five hundred ten thousand, six hundred fifty-six".