90939168077 has 2 divisors, whose sum is σ = 90939168078. Its totient is φ = 90939168076.

The previous prime is 90939168043. The next prime is 90939168101. The reversal of 90939168077 is 77086193909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89006158921 + 1933009156 = 298339^2 + 43966^2 .

It is a cyclic number.

It is not a de Polignac number, because 90939168077 - 2¹² = 90939163981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90939168037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45469584038 + 45469584039.

It is an arithmetic number, because the mean of its divisors is an integer number (45469584039).

Almost surely, 2^90939168077 is an apocalyptic number.

It is an amenable number.

90939168077 is a deficient number, since it is larger than the sum of its proper divisors (1).

90939168077 is an equidigital number, since it uses as much as digits as its factorization.

90939168077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5143824, while the sum is 59.

The spelling of 90939168077 in words is "ninety billion, nine hundred thirty-nine million, one hundred sixty-eight thousand, seventy-seven".