13457812561 has 16 divisors (see below), whose sum is σ = 14317357824. Its totient is φ = 12605946624.

The previous prime is 13457812559. The next prime is 13457812579. The reversal of 13457812561 is 16521875431.

It is not a de Polignac number, because 13457812561 - 2¹ = 13457812559 is a prime.

It is a super-2 number, since 2×13457812561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (201600) is a multiple of the sum of its prime divisors (4200).

It is not an unprimeable number, because it can be changed into a prime (13457812061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4450296 + ... + 4453318.

It is an arithmetic number, because the mean of its divisors is an integer number (894834864).

Almost surely, 2^13457812561 is an apocalyptic number.

It is an amenable number.

13457812561 is a deficient number, since it is larger than the sum of its proper divisors (859545263).

13457812561 is a wasteful number, since it uses less digits than its factorization.

13457812561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200.

The product of its digits is 201600, while the sum is 43.

The spelling of 13457812561 in words is "thirteen billion, four hundred fifty-seven million, eight hundred twelve thousand, five hundred sixty-one".