99865923977 has 2 divisors, whose sum is σ = 99865923978. Its totient is φ = 99865923976.

The previous prime is 99865923973. The next prime is 99865924009. The reversal of 99865923977 is 77932956899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68754608521 + 31111315456 = 262211^2 + 176384^2 .

It is a cyclic number.

It is not a de Polignac number, because 99865923977 - 2² = 99865923973 is a prime.

It is not a weakly prime, because it can be changed into another prime (99865923973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49932961988 + 49932961989.

It is an arithmetic number, because the mean of its divisors is an integer number (49932961989).

Almost surely, 2^99865923977 is an apocalyptic number.

It is an amenable number.

99865923977 is a deficient number, since it is larger than the sum of its proper divisors (1).

99865923977 is an equidigital number, since it uses as much as digits as its factorization.

99865923977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 462944160, while the sum is 74.

The spelling of 99865923977 in words is "ninety-nine billion, eight hundred sixty-five million, nine hundred twenty-three thousand, nine hundred seventy-seven".