1513598720656 has 45 divisors (see below), whose sum is σ = 3223548926409. Its totient is φ = 687974812800.

The previous prime is 1513598720639. The next prime is 1513598720677. The reversal of 1513598720656 is 6560278953151.

It is a happy number.

The square root of 1513598720656 is 1230284.

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

It can be written as a sum of positive squares in only one way, i.e., 353411226256 + 1160187494400 = 594484^2 + 1077120^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1513598720656.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 54118516 + ... + 54146476.

Almost surely, 2^{1513598720656} is an apocalyptic number.

1513598720656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1513598720656 is the 1230284-th square number.

It is an amenable number.

1513598720656 is an abundant number, since it is smaller than the sum of its proper divisors (1709950205753).

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

1513598720656 is an frugal number, since it uses more digits than its factorization.

1513598720656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55952 (or 27974 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 58.

The spelling of 1513598720656 in words is "one trillion, five hundred thirteen billion, five hundred ninety-eight million, seven hundred twenty thousand, six hundred fifty-six".