24961156081 has 3 divisors (see below), whose sum is σ = 24961314073. Its totient is φ = 24960998090.

The previous prime is 24961156061. The next prime is 24961156091. The reversal of 24961156081 is 18065116942.

The square root of 24961156081 is 157991.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 24961156081 - 2⁷ = 24961155953 is a prime.

It is a super-2 number, since 2×24961156081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24961156061) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 78996 + ... + 236986.

Almost surely, 2^24961156081 is an apocalyptic number.

24961156081 is the 157991-st square number.

24961156081 is the 78996-th centered octagonal number.

It is an amenable number.

24961156081 is a deficient number, since it is larger than the sum of its proper divisors (157992).

24961156081 is an frugal number, since it uses more digits than its factorization.

24961156081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315982 (or 157991 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 24961156081 in words is "twenty-four billion, nine hundred sixty-one million, one hundred fifty-six thousand, eighty-one".