999879707257 has 2 divisors, whose sum is σ = 999879707258. Its totient is φ = 999879707256.

The previous prime is 999879707249. The next prime is 999879707261. The reversal of 999879707257 is 752707978999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 824556618601 + 175323088656 = 908051^2 + 418716^2 .

It is a cyclic number.

It is not a de Polignac number, because 999879707257 - 2³ = 999879707249 is a prime.

It is a pancake number, because a pancake can be divided into 999879707257 parts by 1414128 straight cuts.

It is not a weakly prime, because it can be changed into another prime (999879737257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499939853628 + 499939853629.

It is an arithmetic number, because the mean of its divisors is an integer number (499939853629).

Almost surely, 2^999879707257 is an apocalyptic number.

It is an amenable number.

999879707257 is a deficient number, since it is larger than the sum of its proper divisors (1).

999879707257 is an equidigital number, since it uses as much as digits as its factorization.

999879707257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260236880, while the sum is 79.

The spelling of 999879707257 in words is "nine hundred ninety-nine billion, eight hundred seventy-nine million, seven hundred seven thousand, two hundred fifty-seven".