88507722581 has 4 divisors (see below), whose sum is σ = 90666447564. Its totient is φ = 86348997600.

The previous prime is 88507722491. The next prime is 88507722593. The reversal of 88507722581 is 18522770588.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2699737681 + 85807984900 = 51959^2 + 292930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88507722581 is a prime.

It is a super-2 number, since 2×88507722581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88507772581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079362430 + ... + 1079362511.

It is an arithmetic number, because the mean of its divisors is an integer number (22666611891).

Almost surely, 2^88507722581 is an apocalyptic number.

It is an amenable number.

88507722581 is a deficient number, since it is larger than the sum of its proper divisors (2158724983).

88507722581 is a wasteful number, since it uses less digits than its factorization.

88507722581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158724982.

The product of its (nonzero) digits is 2508800, while the sum is 53.

The spelling of 88507722581 in words is "eighty-eight billion, five hundred seven million, seven hundred twenty-two thousand, five hundred eighty-one".