635079892561 has 15 divisors (see below), whose sum is σ = 651712924793. Its totient is φ = 618871357020.

The previous prime is 635079892547. The next prime is 635079892571. The reversal of 635079892561 is 165298970536.

The square root of 635079892561 is 796919.

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

It is not a de Polignac number, because 635079892561 - 2⁹ = 635079892049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 635079892561.

It is not an unprimeable number, because it can be changed into a prime (635079892571) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1473503016 + ... + 1473503446.

Almost surely, 2^635079892561 is an apocalyptic number.

635079892561 is the 796919-th square number.

635079892561 is the 398460-th centered octagonal number.

It is an amenable number.

635079892561 is a deficient number, since it is larger than the sum of its proper divisors (16633032232).

635079892561 is an frugal number, since it uses more digits than its factorization.

635079892561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 635079892561 in words is "six hundred thirty-five billion, seventy-nine million, eight hundred ninety-two thousand, five hundred sixty-one".