8357528301721 has 9 divisors (see below), whose sum is σ = 8736767336479. Its totient is φ = 7994093905336.

The previous prime is 8357528301701. The next prime is 8357528301821. The reversal of 8357528301721 is 1271038257538.

The square root of 8357528301721 is 2890939.

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., 5589843561225 + 2767684740496 = 2364285^2 + 1663636^2 .

It is not a de Polignac number, because 8357528301721 - 2⁷ = 8357528301593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8357528301701) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 66428751 + ... + 66554443.

Almost surely, 2^{8357528301721} is an apocalyptic number.

8357528301721 is the 2890939-th square number.

8357528301721 is the 1445470-th centered octagonal number.

It is an amenable number.

8357528301721 is a deficient number, since it is larger than the sum of its proper divisors (379239034758).

8357528301721 is an frugal number, since it uses more digits than its factorization.

8357528301721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251432 (or 125716 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 8357528301721 in words is "eight trillion, three hundred fifty-seven billion, five hundred twenty-eight million, three hundred one thousand, seven hundred twenty-one".