1215854664964 has 27 divisors (see below), whose sum is σ = 2134051077991. Its totient is φ = 606131102600.

The previous prime is 1215854664929. The next prime is 1215854664971. The reversal of 1215854664964 is 4694664585121.

The square root of 1215854664964 is 1102658.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1056345789 + ... + 1056346939.

Almost surely, 2^{1215854664964} is an apocalyptic number.

1215854664964 is the 1102658-th square number.

It is an amenable number.

1215854664964 is a deficient number, since it is larger than the sum of its proper divisors (918196413027).

1215854664964 is an frugal number, since it uses more digits than its factorization.

1215854664964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264 (or 1632 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 61.

The spelling of 1215854664964 in words is "one trillion, two hundred fifteen billion, eight hundred fifty-four million, six hundred sixty-four thousand, nine hundred sixty-four".