251036342040 has 64 divisors (see below), whose sum is σ = 821573487360. Its totient is φ = 60857294720.

The previous prime is 251036342021. The next prime is 251036342057. The reversal of 251036342040 is 40243630152.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 251036341989 and 251036342007.

It is a congruent number.

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, 95088204 + ... + 95090843.

It is an arithmetic number, because the mean of its divisors is an integer number (12837085740).

Almost surely, 2^251036342040 is an apocalyptic number.

251036342040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251036342040 is an abundant number, since it is smaller than the sum of its proper divisors (570537145320).

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

251036342040 is a wasteful number, since it uses less digits than its factorization.

251036342040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190179072 (or 190179068 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 251036342040 its reverse (40243630152), we get a palindrome (291279972192).

The spelling of 251036342040 in words is "two hundred fifty-one billion, thirty-six million, three hundred forty-two thousand, forty".