997989639165331 has 8 divisors (see below), whose sum is σ = 1005171549827760. Its totient is φ = 990807758918688.

The previous prime is 997989639165329. The next prime is 997989639165401. The reversal of 997989639165331 is 133561936989799.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997989639165331 - 2¹ = 997989639165329 is a prime.

It is a super-2 number, since 2×997989639165331² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997989639165131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60438225 + ... + 75158221.

It is an arithmetic number, because the mean of its divisors is an integer number (125646443728470).

Almost surely, 2^{997989639165331} is an apocalyptic number.

997989639165331 is a deficient number, since it is larger than the sum of its proper divisors (7181910662429).

997989639165331 is a wasteful number, since it uses less digits than its factorization.

997989639165331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15207893.

The product of its digits is 16070775840, while the sum is 88.

The spelling of 997989639165331 in words is "nine hundred ninety-seven trillion, nine hundred eighty-nine billion, six hundred thirty-nine million, one hundred sixty-five thousand, three hundred thirty-one".