997631759540 has 48 divisors (see below), whose sum is σ = 2311211463120. Its totient is φ = 359372037120.

The previous prime is 997631759521. The next prime is 997631759543. The reversal of 997631759540 is 45957136799.

997631759540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 103752275236 + 893879484304 = 322106^2 + 945452^2 .

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997631759543) 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, 46782575 + ... + 46803894.

It is an arithmetic number, because the mean of its divisors is an integer number (48150238815).

Almost surely, 2^997631759540 is an apocalyptic number.

It is an amenable number.

997631759540 is an abundant number, since it is smaller than the sum of its proper divisors (1313579703580).

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

997631759540 is a wasteful number, since it uses less digits than its factorization.

997631759540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93586532 (or 93586530 counting only the distinct ones).

The product of its (nonzero) digits is 64297800, while the sum is 65.

The spelling of 997631759540 in words is "nine hundred ninety-seven billion, six hundred thirty-one million, seven hundred fifty-nine thousand, five hundred forty".