90740694175681 has 27 divisors (see below), whose sum is σ = 99972622100673. Its totient is φ = 82299404955240.

The previous prime is 90740694175673. The next prime is 90740694175783. The reversal of 90740694175681 is 18657149604709.

The square root of 90740694175681 is 9525791.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 90740694175681 - 2³ = 90740694175673 is a prime.

It is a super-2 number, since 2×90740694175681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90740694175081) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 64861110220 + ... + 64861111618.

Almost surely, 2^{90740694175681} is an apocalyptic number.

90740694175681 is the 9525791-st square number.

90740694175681 is the 4762896-th centered octagonal number.

It is an amenable number.

90740694175681 is a deficient number, since it is larger than the sum of its proper divisors (9231927924992).

90740694175681 is an frugal number, since it uses more digits than its factorization.

90740694175681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058 (or 2029 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 67.

The spelling of 90740694175681 in words is "ninety trillion, seven hundred forty billion, six hundred ninety-four million, one hundred seventy-five thousand, six hundred eighty-one".