1997859338370 has 128 divisors (see below), whose sum is σ = 6117571860480. Its totient is φ = 454489237440.

The previous prime is 1997859338369. The next prime is 1997859338383. The reversal of 1997859338370 is 738339587991.

1997859338370 is a `hidden beast` number, since 1 + 9 + 97 + 8 + 5 + 93 + 383 + 70 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2106112 + ... + 2903691.

It is an arithmetic number, because the mean of its divisors is an integer number (47793530160).

Almost surely, 2^{1997859338370} is an apocalyptic number.

1997859338370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997859338370 is an abundant number, since it is smaller than the sum of its proper divisors (4119712522110).

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

1997859338370 is a wasteful number, since it uses less digits than its factorization.

1997859338370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5010037 (or 5010031 counting only the distinct ones).

The product of its (nonzero) digits is 308629440, while the sum is 72.

The spelling of 1997859338370 in words is "one trillion, nine hundred ninety-seven billion, eight hundred fifty-nine million, three hundred thirty-eight thousand, three hundred seventy".