753963992721 has 15 divisors (see below), whose sum is σ = 1126303564441. Its totient is φ = 502637451948.

The previous prime is 753963992693. The next prime is 753963992723. The reversal of 753963992721 is 127299369357.

The square root of 753963992721 is 868311.

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

753963992721 is a `hidden beast` number, since 7 + 539 + 6 + 3 + 9 + 92 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 753963992721 - 2²¹ = 753961895569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (753963992723) by changing a digit.

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 14 ways as a sum of consecutive naturals, for example, 7766560 + ... + 7863038.

Almost surely, 2^753963992721 is an apocalyptic number.

753963992721 is the 868311-st square number.

753963992721 is the 434156-th centered octagonal number.

It is an amenable number.

753963992721 is a deficient number, since it is larger than the sum of its proper divisors (372339571720).

753963992721 is an frugal number, since it uses more digits than its factorization.

753963992721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192970 (or 96482 counting only the distinct ones).

The product of its digits is 38578680, while the sum is 63.

The spelling of 753963992721 in words is "seven hundred fifty-three billion, nine hundred sixty-three million, nine hundred ninety-two thousand, seven hundred twenty-one".