90035815681 has 32 divisors (see below), whose sum is σ = 107455612928. Its totient is φ = 73818501120.

The previous prime is 90035815669. The next prime is 90035815687. The reversal of 90035815681 is 18651853009.

It is not a de Polignac number, because 90035815681 - 2¹³ = 90035807489 is a prime.

It is a super-2 number, since 2×90035815681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90035815687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6568471 + ... + 6582163.

It is an arithmetic number, because the mean of its divisors is an integer number (3357987904).

Almost surely, 2^90035815681 is an apocalyptic number.

It is an amenable number.

90035815681 is a deficient number, since it is larger than the sum of its proper divisors (17419797247).

90035815681 is a wasteful number, since it uses less digits than its factorization.

90035815681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14081.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 90035815681 in words is "ninety billion, thirty-five million, eight hundred fifteen thousand, six hundred eighty-one".