57155987898 has 48 divisors (see below), whose sum is σ = 126240716160. Its totient is φ = 18682720992.

The previous prime is 57155987897. The next prime is 57155987899. The reversal of 57155987898 is 89878955175.

It is an interprime number because it is at equal distance from previous prime (57155987897) and next prime (57155987899).

It is not an unprimeable number, because it can be changed into a prime (57155987893) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1930515 + ... + 1959897.

It is an arithmetic number, because the mean of its divisors is an integer number (2630014920).

Almost surely, 2^57155987898 is an apocalyptic number.

57155987898 is an abundant number, since it is smaller than the sum of its proper divisors (69084728262).

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

57155987898 is a wasteful number, since it uses less digits than its factorization.

57155987898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31483 (or 31480 counting only the distinct ones).

The product of its digits is 254016000, while the sum is 72.

The spelling of 57155987898 in words is "fifty-seven billion, one hundred fifty-five million, nine hundred eighty-seven thousand, eight hundred ninety-eight".