88077707721581 has 2 divisors, whose sum is σ = 88077707721582. Its totient is φ = 88077707721580.

The previous prime is 88077707721547. The next prime is 88077707721623. The reversal of 88077707721581 is 18512770777088.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54121844130025 + 33955863591556 = 7356755^2 + 5827166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-88077707721581 is a prime.

It is a super-2 number, since 2×88077707721581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88077707721281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44038853860790 + 44038853860791.

It is an arithmetic number, because the mean of its divisors is an integer number (44038853860791).

Almost surely, 2^{88077707721581} is an apocalyptic number.

It is an amenable number.

88077707721581 is a deficient number, since it is larger than the sum of its proper divisors (1).

88077707721581 is an equidigital number, since it uses as much as digits as its factorization.

88077707721581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86051840, while the sum is 68.

The spelling of 88077707721581 in words is "eighty-eight trillion, seventy-seven billion, seven hundred seven million, seven hundred twenty-one thousand, five hundred eighty-one".