997164512851 has 16 divisors (see below), whose sum is σ = 1084858398400. Its totient is φ = 911088414720.

The previous prime is 997164512819. The next prime is 997164512881. The reversal of 997164512851 is 158215461799.

It is a 12-Lehmer number, since φ(997164512851) divides (997164512851-1)¹².

It is a cyclic number.

It is not a de Polignac number, because 997164512851 - 2⁵ = 997164512819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997164512881) 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, 499290 + ... + 1497871.

It is an arithmetic number, because the mean of its divisors is an integer number (67803649900).

Almost surely, 2^997164512851 is an apocalyptic number.

997164512851 is the 499291-st decagonal number.

997164512851 is a deficient number, since it is larger than the sum of its proper divisors (87693885549).

997164512851 is a wasteful number, since it uses less digits than its factorization.

997164512851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997566.

The product of its digits is 5443200, while the sum is 58.

The spelling of 997164512851 in words is "nine hundred ninety-seven billion, one hundred sixty-four million, five hundred twelve thousand, eight hundred fifty-one".