90943320657 has 16 divisors (see below), whose sum is σ = 139155327872. Its totient is φ = 51751975680.

The previous prime is 90943320647. The next prime is 90943320661. The reversal of 90943320657 is 75602334909.

It is a happy number.

It is not a de Polignac number, because 90943320657 - 2³² = 86648353361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90943320647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8979658 + ... + 8989779.

It is an arithmetic number, because the mean of its divisors is an integer number (8697207992).

Almost surely, 2^90943320657 is an apocalyptic number.

It is an amenable number.

90943320657 is a deficient number, since it is larger than the sum of its proper divisors (48212007215).

90943320657 is a wasteful number, since it uses less digits than its factorization.

90943320657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17969688.

The product of its (nonzero) digits is 1224720, while the sum is 48.

The spelling of 90943320657 in words is "ninety billion, nine hundred forty-three million, three hundred twenty thousand, six hundred fifty-seven".