997385508057 has 4 divisors (see below), whose sum is σ = 1329847344080. Its totient is φ = 664923672036.

The previous prime is 997385508043. The next prime is 997385508059. The reversal of 997385508057 is 750805583799.

997385508057 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 997385508057 - 2⁷ = 997385507929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997385508059) 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, 166230918007 + ... + 166230918012.

It is an arithmetic number, because the mean of its divisors is an integer number (332461836020).

Almost surely, 2^997385508057 is an apocalyptic number.

It is an amenable number.

997385508057 is a deficient number, since it is larger than the sum of its proper divisors (332461836023).

997385508057 is a wasteful number, since it uses less digits than its factorization.

997385508057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332461836022.

The product of its (nonzero) digits is 95256000, while the sum is 66.

The spelling of 997385508057 in words is "nine hundred ninety-seven billion, three hundred eighty-five million, five hundred eight thousand, fifty-seven".