90520656659 has 4 divisors (see below), whose sum is σ = 91871711304. Its totient is φ = 89169602016.

The previous prime is 90520656647. The next prime is 90520656683. The reversal of 90520656659 is 95665602509.

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

It is a cyclic number.

It is not a de Polignac number, because 90520656659 - 2¹⁶ = 90520591123 is a prime.

It is a super-2 number, since 2×90520656659² (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 90520656659.

It is not an unprimeable number, because it can be changed into a prime (90520656059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675527222 + ... + 675527355.

It is an arithmetic number, because the mean of its divisors is an integer number (22967927826).

Almost surely, 2^90520656659 is an apocalyptic number.

90520656659 is a deficient number, since it is larger than the sum of its proper divisors (1351054645).

90520656659 is a wasteful number, since it uses less digits than its factorization.

90520656659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351054644.

The product of its (nonzero) digits is 4374000, while the sum is 53.

The spelling of 90520656659 in words is "ninety billion, five hundred twenty million, six hundred fifty-six thousand, six hundred fifty-nine".