251158875540 has 96 divisors (see below), whose sum is σ = 711274507776. Its totient is φ = 66212966400.

The previous prime is 251158875523. The next prime is 251158875547. The reversal of 251158875540 is 45578851152.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251158875547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4047589 + ... + 4109171.

It is an arithmetic number, because the mean of its divisors is an integer number (7409109456).

Almost surely, 2^251158875540 is an apocalyptic number.

251158875540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251158875540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355637253888).

251158875540 is an abundant number, since it is smaller than the sum of its proper divisors (460115632236).

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

251158875540 is a wasteful number, since it uses less digits than its factorization.

251158875540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62369 (or 62367 counting only the distinct ones).

The product of its (nonzero) digits is 2240000, while the sum is 51.

The spelling of 251158875540 in words is "two hundred fifty-one billion, one hundred fifty-eight million, eight hundred seventy-five thousand, five hundred forty".