997657989351 has 16 divisors (see below), whose sum is σ = 1408315520640. Its totient is φ = 626457581280.

The previous prime is 997657989323. The next prime is 997657989379. The reversal of 997657989351 is 153989756799.

It is an interprime number because it is at equal distance from previous prime (997657989323) and next prime (997657989379).

It is not a de Polignac number, because 997657989351 - 2¹⁵ = 997657956583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997657989311) 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, 50576185 + ... + 50595906.

It is an arithmetic number, because the mean of its divisors is an integer number (88019720040).

Almost surely, 2^997657989351 is an apocalyptic number.

997657989351 is a deficient number, since it is larger than the sum of its proper divisors (410657531289).

997657989351 is a wasteful number, since it uses less digits than its factorization.

997657989351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101172286.

The product of its digits is 1157360400, while the sum is 78.

The spelling of 997657989351 in words is "nine hundred ninety-seven billion, six hundred fifty-seven million, nine hundred eighty-nine thousand, three hundred fifty-one".