2557166840 has 32 divisors (see below), whose sum is σ = 5774880960. Its totient is φ = 1019088000.

The previous prime is 2557166797. The next prime is 2557166861. The reversal of 2557166840 is 486617552.

It is a junction number, because it is equal to n+sod(n) for n = 2557166791 and 2557166800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107111 + ... + 128790.

It is an arithmetic number, because the mean of its divisors is an integer number (180465030).

Almost surely, 2^2557166840 is an apocalyptic number.

2557166840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2557166840 is an abundant number, since it is smaller than the sum of its proper divisors (3217714120).

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

2557166840 is a wasteful number, since it uses less digits than its factorization.

2557166840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236183 (or 236179 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 2557166840 is about 50568.4371915921. The cubic root of 2557166840 is about 1367.4759215347.

The spelling of 2557166840 in words is "two billion, five hundred fifty-seven million, one hundred sixty-six thousand, eight hundred forty".