23547561681 has 16 divisors (see below), whose sum is σ = 36042911744. Its totient is φ = 13395407184.

The previous prime is 23547561677. The next prime is 23547561683. The reversal of 23547561681 is 18616574532.

It is not a de Polignac number, because 23547561681 - 2² = 23547561677 is a prime.

It is a super-2 number, since 2×23547561681² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23547561681.

It is not an unprimeable number, because it can be changed into a prime (23547561683) 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 15 ways as a sum of consecutive naturals, for example, 2509471 + ... + 2518836.

It is an arithmetic number, because the mean of its divisors is an integer number (2252681984).

Almost surely, 2^23547561681 is an apocalyptic number.

23547561681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23547561681 is a deficient number, since it is larger than the sum of its proper divisors (12495350063).

23547561681 is a wasteful number, since it uses less digits than its factorization.

23547561681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028540.

The product of its digits is 1209600, while the sum is 48.

The spelling of 23547561681 in words is "twenty-three billion, five hundred forty-seven million, five hundred sixty-one thousand, six hundred eighty-one".