999997555311612 has 144 divisors (see below), whose sum is σ = 3018373148525280. Its totient is φ = 275134028659200.

The previous prime is 999997555311611. The next prime is 999997555311647. The reversal of 999997555311612 is 216113555799999.

999997555311612 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 9 + 7 + 55 + 531 + 16 + 12 = 666.

It is a super-2 number, since 2×999997555311612² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999997555311611) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1591896787 + ... + 1592524842.

Almost surely, 2^{999997555311612} is an apocalyptic number.

It is an amenable number.

999997555311612 is an abundant number, since it is smaller than the sum of its proper divisors (2018375593213668).

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

999997555311612 is a wasteful number, since it uses less digits than its factorization.

999997555311612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3184421724 (or 3184421719 counting only the distinct ones).

The product of its digits is 1860043500, while the sum is 81.

The spelling of 999997555311612 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, five hundred fifty-five million, three hundred eleven thousand, six hundred twelve".