999997555311528 has 64 divisors (see below), whose sum is σ = 2507574136259520. Its totient is φ = 332321840716800.

The previous prime is 999997555311509. The next prime is 999997555311529. The reversal of 999997555311528 is 825113555799999.

999997555311528 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×999997555311528² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999997555311529) 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, 782616208 + ... + 783892928.

It is an arithmetic number, because the mean of its divisors is an integer number (39180845879055).

Almost surely, 2^{999997555311528} is an apocalyptic number.

It is an amenable number.

999997555311528 is an abundant number, since it is smaller than the sum of its proper divisors (1507576580947992).

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

999997555311528 is a wasteful number, since it uses less digits than its factorization.

999997555311528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375658 (or 1375654 counting only the distinct ones).

The product of its digits is 12400290000, while the sum is 87.

The spelling of 999997555311528 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred fifty-five million, three hundred eleven thousand, five hundred twenty-eight".