76821052916644 has 9 divisors (see below), whose sum is σ = 134436873280801. Its totient is φ = 38410517693560.

The previous prime is 76821052916633. The next prime is 76821052916653. The reversal of 76821052916644 is 44661925012867.

The square root of 76821052916644 is 8764762.

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., 27278036774244 + 49543016142400 = 5222838^2 + 7038680^2 .

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, 15338334 + ... + 19720714.

Almost surely, 2^{76821052916644} is an apocalyptic number.

76821052916644 is the 8764762-nd square number.

It is an amenable number.

76821052916644 is a deficient number, since it is larger than the sum of its proper divisors (57615820364157).

76821052916644 is an frugal number, since it uses more digits than its factorization.

76821052916644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8764766 (or 4382383 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 76821052916644 in words is "seventy-six trillion, eight hundred twenty-one billion, fifty-two million, nine hundred sixteen thousand, six hundred forty-four".