23537122578 has 18 divisors (see below), whose sum is σ = 50998509237. Its totient is φ = 7845490560.

The previous prime is 23537122577. The next prime is 23537122603. The reversal of 23537122578 is 87522173532.

23537122578 is a `hidden beast` number, since 2 + 3 + 5 + 3 + 71 + 2 + 2 + 578 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21230529849 + 2306592729 = 145707^2 + 48027^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=108483.

It is a super-2 number, since 2×23537122578² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23537122571) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 632818 + ... + 668978.

Almost surely, 2^23537122578 is an apocalyptic number.

23537122578 is an abundant number, since it is smaller than the sum of its proper divisors (27461386659).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23537122578 is an frugal number, since it uses more digits than its factorization.

23537122578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72330 (or 36166 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The spelling of 23537122578 in words is "twenty-three billion, five hundred thirty-seven million, one hundred twenty-two thousand, five hundred seventy-eight".