997987903690608 has 200 divisors, whose sum is σ = 2999935180002816. Its totient is φ = 319956539356800.

The previous prime is 997987903690607. The next prime is 997987903690699. The reversal of 997987903690608 is 806096309789799.

997987903690608 is a `hidden beast` number, since 9 + 97 + 98 + 79 + 0 + 369 + 0 + 6 + 0 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997987903690607) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 69648858 + ... + 82746233.

Almost surely, 2^{997987903690608} is an apocalyptic number.

It is an amenable number.

997987903690608 is an abundant number, since it is smaller than the sum of its proper divisors (2001947276312208).

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

997987903690608 is a wasteful number, since it uses less digits than its factorization.

997987903690608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152395305 (or 152395290 counting only the distinct ones).

The product of its (nonzero) digits is 19999187712, while the sum is 90.

The spelling of 997987903690608 in words is "nine hundred ninety-seven trillion, nine hundred eighty-seven billion, nine hundred three million, six hundred ninety thousand, six hundred eight".