251300340240 has 80 divisors (see below), whose sum is σ = 779151702528. Its totient is φ = 67003045888.

The previous prime is 251300340233. The next prime is 251300340271. The reversal of 251300340240 is 42043003152.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×251300340240² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 251300340240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539169 + ... + 1694591.

Almost surely, 2^251300340240 is an apocalyptic number.

251300340240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251300340240 is an abundant number, since it is smaller than the sum of its proper divisors (527851362288).

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

251300340240 is a wasteful number, since it uses less digits than its factorization.

251300340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162176 (or 162170 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 251300340240 its reverse (42043003152), we get a palindrome (293343343392).

The spelling of 251300340240 in words is "two hundred fifty-one billion, three hundred million, three hundred forty thousand, two hundred forty".