997150889502 has 128 divisors (see below), whose sum is σ = 2250058867200. Its totient is φ = 327307039488.

The previous prime is 997150889429. The next prime is 997150889533. The reversal of 997150889502 is 205988051799.

997150889502 is a `hidden beast` number, since 9 + 9 + 71 + 50 + 8 + 8 + 9 + 502 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 997150889502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1099394133 + ... + 1099395039.

It is an arithmetic number, because the mean of its divisors is an integer number (17578584900).

Almost surely, 2^997150889502 is an apocalyptic number.

997150889502 is an abundant number, since it is smaller than the sum of its proper divisors (1252907977698).

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

997150889502 is a wasteful number, since it uses less digits than its factorization.

997150889502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087 (or 2081 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 63.

The spelling of 997150889502 in words is "nine hundred ninety-seven billion, one hundred fifty million, eight hundred eighty-nine thousand, five hundred two".