999732017957 has 2 divisors, whose sum is σ = 999732017958. Its totient is φ = 999732017956.

The previous prime is 999732017941. The next prime is 999732017987. The reversal of 999732017957 is 759710237999.

It is a Cunningham number, because it is equal to 999866²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999732017956 + 1 = 999866^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 999732017957 - 2⁴ = 999732017941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999732017917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499866008978 + 499866008979.

It is an arithmetic number, because the mean of its divisors is an integer number (499866008979).

Almost surely, 2^999732017957 is an apocalyptic number.

It is an amenable number.

999732017957 is a deficient number, since it is larger than the sum of its proper divisors (1).

999732017957 is an equidigital number, since it uses as much as digits as its factorization.

999732017957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67512690, while the sum is 68.

The spelling of 999732017957 in words is "nine hundred ninety-nine billion, seven hundred thirty-two million, seventeen thousand, nine hundred fifty-seven".