999860763257 has 2 divisors, whose sum is σ = 999860763258. Its totient is φ = 999860763256.

The previous prime is 999860763211. The next prime is 999860763331. The reversal of 999860763257 is 752367068999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728173795561 + 271686967696 = 853331^2 + 521236^2 .

It is a cyclic number.

It is not a de Polignac number, because 999860763257 - 2²⁰ = 999859714681 is a prime.

It is not a weakly prime, because it can be changed into another prime (999860763157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499930381628 + 499930381629.

It is an arithmetic number, because the mean of its divisors is an integer number (499930381629).

Almost surely, 2^999860763257 is an apocalyptic number.

It is an amenable number.

999860763257 is a deficient number, since it is larger than the sum of its proper divisors (1).

999860763257 is an equidigital number, since it uses as much as digits as its factorization.

999860763257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 308629440, while the sum is 71.

The spelling of 999860763257 in words is "nine hundred ninety-nine billion, eight hundred sixty million, seven hundred sixty-three thousand, two hundred fifty-seven".