90639247277 has 2 divisors, whose sum is σ = 90639247278. Its totient is φ = 90639247276.

The previous prime is 90639247271. The next prime is 90639247291. The reversal of 90639247277 is 77274293609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72829277161 + 17809970116 = 269869^2 + 133454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90639247277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90639247271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45319623638 + 45319623639.

It is an arithmetic number, because the mean of its divisors is an integer number (45319623639).

Almost surely, 2^90639247277 is an apocalyptic number.

It is an amenable number.

90639247277 is a deficient number, since it is larger than the sum of its proper divisors (1).

90639247277 is an equidigital number, since it uses as much as digits as its factorization.

90639247277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8001504, while the sum is 56.

The spelling of 90639247277 in words is "ninety billion, six hundred thirty-nine million, two hundred forty-seven thousand, two hundred seventy-seven".