754359994521 has 81 divisors (see below), whose sum is σ = 1291219711743. Its totient is φ = 423152200800.

The previous prime is 754359994499. The next prime is 754359994567. The reversal of 754359994521 is 125499953457.

The square root of 754359994521 is 868539.

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

754359994521 is a `hidden beast` number, since 7 + 5 + 43 + 59 + 99 + 452 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 650585814921 + 103774179600 = 806589^2 + 322140^2 .

It is not a de Polignac number, because 754359994521 - 2⁷ = 754359994393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (754359990521) 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 80 ways as a sum of consecutive naturals, for example, 1076119471 + ... + 1076120171.

Almost surely, 2^754359994521 is an apocalyptic number.

754359994521 is the 868539-th square number.

754359994521 is the 434270-th centered octagonal number.

It is an amenable number.

754359994521 is a deficient number, since it is larger than the sum of its proper divisors (536859717222).

754359994521 is an frugal number, since it uses more digits than its factorization.

754359994521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540 (or 770 counting only the distinct ones).

The product of its digits is 61236000, while the sum is 63.

The spelling of 754359994521 in words is "seven hundred fifty-four billion, three hundred fifty-nine million, nine hundred ninety-four thousand, five hundred twenty-one".