999997999757 has 2 divisors, whose sum is σ = 999997999758. Its totient is φ = 999997999756.

The previous prime is 999997999751. The next prime is 999997999799. The reversal of 999997999757 is 757999799999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 977763014761 + 22234984996 = 988819^2 + 149114^2 .

It is a cyclic number.

It is not a de Polignac number, because 999997999757 - 2¹⁴ = 999997983373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999997999751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998999878 + 499998999879.

It is an arithmetic number, because the mean of its divisors is an integer number (499998999879).

Almost surely, 2^999997999757 is an apocalyptic number.

It is an amenable number.

999997999757 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997999757 is an equidigital number, since it uses as much as digits as its factorization.

999997999757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73825126515, while the sum is 98.

The spelling of 999997999757 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, seven hundred fifty-seven".