251151011423040 has 112 divisors (see below), whose sum is σ = 797517126506880. Its totient is φ = 66964140349440.

The previous prime is 251151011423023. The next prime is 251151011423069. The reversal of 251151011423040 is 40324110151152.

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 = 251151011422989 and 251151011423007.

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, 11682451 + ... + 25274130.

Almost surely, 2^{251151011423040} is an apocalyptic number.

251151011423040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251151011423040 is an abundant number, since it is smaller than the sum of its proper divisors (546366115083840).

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

251151011423040 is a wasteful number, since it uses less digits than its factorization.

251151011423040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36963680 (or 36963670 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

Adding to 251151011423040 its reverse (40324110151152), we get a palindrome (291475121574192).

The spelling of 251151011423040 in words is "two hundred fifty-one trillion, one hundred fifty-one billion, eleven million, four hundred twenty-three thousand, forty".