249279554840 has 16 divisors (see below), whose sum is σ = 560878998480. Its totient is φ = 99711821920.

The previous prime is 249279554833. The next prime is 249279554861. The reversal of 249279554840 is 48455972942.

It is a super-2 number, since 2×249279554840² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 249279554840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3115994396 + ... + 3115994475.

It is an arithmetic number, because the mean of its divisors is an integer number (35054937405).

Almost surely, 2^249279554840 is an apocalyptic number.

249279554840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249279554840 is an abundant number, since it is smaller than the sum of its proper divisors (311599443640).

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

249279554840 is a wasteful number, since it uses less digits than its factorization.

249279554840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231988882 (or 6231988878 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 59.

The spelling of 249279554840 in words is "two hundred forty-nine billion, two hundred seventy-nine million, five hundred fifty-four thousand, eight hundred forty".