2557217980 has 24 divisors (see below), whose sum is σ = 5652798480. Its totient is φ = 969050880.

The previous prime is 2557217969. The next prime is 2557217981. The reversal of 2557217980 is 897127552.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2557217980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557217981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3364381 + ... + 3365140.

It is an arithmetic number, because the mean of its divisors is an integer number (235533270).

Almost surely, 2^2557217980 is an apocalyptic number.

2557217980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2557217980 is an abundant number, since it is smaller than the sum of its proper divisors (3095580500).

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

2557217980 is a wasteful number, since it uses less digits than its factorization.

2557217980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6729549 (or 6729547 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 2557217980 is about 50568.9428404431. The cubic root of 2557217980 is about 1367.4850373853.

The spelling of 2557217980 in words is "two billion, five hundred fifty-seven million, two hundred seventeen thousand, nine hundred eighty".