1857997991056 has 45 divisors (see below), whose sum is σ = 3612794681241. Its totient is φ = 925675796736.

The previous prime is 1857997991039. The next prime is 1857997991063. The reversal of 1857997991056 is 6501997997581.

The square root of 1857997991056 is 1363084.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 208355731600 + 1649642259456 = 456460^2 + 1284384^2 .

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 2360861095 + ... + 2360861881.

Almost surely, 2^{1857997991056} is an apocalyptic number.

1857997991056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1857997991056 is the 1363084-th square number.

It is an amenable number.

1857997991056 is a deficient number, since it is larger than the sum of its proper divisors (1754796690185).

1857997991056 is an frugal number, since it uses more digits than its factorization.

1857997991056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 385786800, while the sum is 76.

The spelling of 1857997991056 in words is "one trillion, eight hundred fifty-seven billion, nine hundred ninety-seven million, nine hundred ninety-one thousand, fifty-six".