999999997752 has 64 divisors (see below), whose sum is σ = 2891566298880. Its totient is φ = 282271940352.

The previous prime is 999999997723. The next prime is 999999997753. The reversal of 999999997752 is 257799999999.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999997753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35843773 + ... + 35871660.

It is an arithmetic number, because the mean of its divisors is an integer number (45180723420).

Almost surely, 2^999999997752 is an apocalyptic number.

It is an amenable number.

999999997752 is an abundant number, since it is smaller than the sum of its proper divisors (1891566301128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999999997752 is a wasteful number, since it uses less digits than its factorization.

999999997752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71715532 (or 71715528 counting only the distinct ones).

The product of its digits is 21092893290, while the sum is 93.

The spelling of 999999997752 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred fifty-two".