997641847880 has 64 divisors (see below), whose sum is σ = 2248138368000. Its totient is φ = 398444901120.

The previous prime is 997641847879. The next prime is 997641847907. The reversal of 997641847880 is 88748146799.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87514421 + ... + 87525819.

It is an arithmetic number, because the mean of its divisors is an integer number (35127162000).

Almost surely, 2^997641847880 is an apocalyptic number.

It is an amenable number.

997641847880 is an abundant number, since it is smaller than the sum of its proper divisors (1250496520120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997641847880 is a wasteful number, since it uses less digits than its factorization.

997641847880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14574 (or 14570 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 71.

The spelling of 997641847880 in words is "nine hundred ninety-seven billion, six hundred forty-one million, eight hundred forty-seven thousand, eight hundred eighty".