23572549494649 has 9 divisors (see below), whose sum is σ = 23900243932173. Its totient is φ = 23249288286432.

The previous prime is 23572549494607. The next prime is 23572549494701. The reversal of 23572549494649 is 94649494527532.

The square root of 23572549494649 is 4855157.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4702804274025 + 18869745220624 = 2168595^2 + 4343932^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23572549494649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23572549492649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 354393207 + ... + 354459715.

Almost surely, 2^{23572549494649} is an apocalyptic number.

23572549494649 is the 4855157-th square number.

23572549494649 is the 2427579-th centered octagonal number.

It is an amenable number.

23572549494649 is a deficient number, since it is larger than the sum of its proper divisors (327694437524).

23572549494649 is an frugal number, since it uses more digits than its factorization.

23572549494649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133164 (or 66582 counting only the distinct ones).

The product of its digits is 2351462400, while the sum is 73.

The spelling of 23572549494649 in words is "twenty-three trillion, five hundred seventy-two billion, five hundred forty-nine million, four hundred ninety-four thousand, six hundred forty-nine".