997132558507 has 4 divisors (see below), whose sum is σ = 997135054920. Its totient is φ = 997130062096.

The previous prime is 997132558469. The next prime is 997132558519. The reversal of 997132558507 is 705855231799.

997132558507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705855231799 = 37 ⋅19077168427.

It is a 4-Lehmer number, since φ(997132558507) divides (997132558507-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 997132558507 - 2¹⁹ = 997132034219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997132558547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499282 + ... + 1497847.

It is an arithmetic number, because the mean of its divisors is an integer number (249283763730).

It is a Poulet number, since it divides 2^997132558506-1.

Almost surely, 2^997132558507 is an apocalyptic number.

997132558507 is the 499283-rd decagonal number.

997132558507 is a deficient number, since it is larger than the sum of its proper divisors (2496413).

997132558507 is a wasteful number, since it uses less digits than its factorization.

997132558507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496412.

The product of its (nonzero) digits is 23814000, while the sum is 61.

The spelling of 997132558507 in words is "nine hundred ninety-seven billion, one hundred thirty-two million, five hundred fifty-eight thousand, five hundred seven".