90155337681 has 4 divisors (see below), whose sum is σ = 120207116912. Its totient is φ = 60103558452.

The previous prime is 90155337661. The next prime is 90155337683. The reversal of 90155337681 is 18673355109.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90155337681 - 2⁶ = 90155337617 is a prime.

It is a super-2 number, since 2×90155337681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90155337681.

It is not an unprimeable number, because it can be changed into a prime (90155337683) 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, 15025889611 + ... + 15025889616.

It is an arithmetic number, because the mean of its divisors is an integer number (30051779228).

Almost surely, 2^90155337681 is an apocalyptic number.

It is an amenable number.

90155337681 is a deficient number, since it is larger than the sum of its proper divisors (30051779231).

90155337681 is a wasteful number, since it uses less digits than its factorization.

90155337681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30051779230.

The product of its (nonzero) digits is 680400, while the sum is 48.

The spelling of 90155337681 in words is "ninety billion, one hundred fifty-five million, three hundred thirty-seven thousand, six hundred eighty-one".