1997230977040 has 160 divisors (see below), whose sum is σ = 5303135577600. Its totient is φ = 692983652352.

The previous prime is 1997230977013. The next prime is 1997230977139. The reversal of 1997230977040 is 407790327991.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11351661 + ... + 11526259.

It is an arithmetic number, because the mean of its divisors is an integer number (33144597360).

Almost surely, 2^{1997230977040} is an apocalyptic number.

1997230977040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997230977040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2651567788800).

1997230977040 is an abundant number, since it is smaller than the sum of its proper divisors (3305904600560).

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

1997230977040 is a wasteful number, since it uses less digits than its factorization.

1997230977040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175289 (or 175283 counting only the distinct ones).

The product of its (nonzero) digits is 6001128, while the sum is 58.

The spelling of 1997230977040 in words is "one trillion, nine hundred ninety-seven billion, two hundred thirty million, nine hundred seventy-seven thousand, forty".