251240196672 has 84 divisors (see below), whose sum is σ = 721228519440. Its totient is φ = 83619524352.

The previous prime is 251240196611. The next prime is 251240196673. The reversal of 251240196672 is 276691042152.

251240196672 is a `hidden beast` number, since 2 + 512 + 4 + 0 + 1 + 9 + 66 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (251240196673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48643 + ... + 710525.

Almost surely, 2^251240196672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251240196672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360614259720).

251240196672 is an abundant number, since it is smaller than the sum of its proper divisors (469988322768).

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

251240196672 is a wasteful number, since it uses less digits than its factorization.

251240196672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662560 (or 662547 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 251240196672 in words is "two hundred fifty-one billion, two hundred forty million, one hundred ninety-six thousand, six hundred seventy-two".