251665116030642 has 16 divisors (see below), whose sum is σ = 503330405191200. Its totient is φ = 83888343155232.

The previous prime is 251665116030607. The next prime is 251665116030661. The reversal of 251665116030642 is 246030611566152.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 251665116030591 and 251665116030600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19024473 + ... + 29415315.

It is an arithmetic number, because the mean of its divisors is an integer number (31458150324450).

Almost surely, 2^{251665116030642} is an apocalyptic number.

251665116030642 is an abundant number, since it is smaller than the sum of its proper divisors (251665289160558).

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

251665116030642 is a wasteful number, since it uses less digits than its factorization.

251665116030642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14427497.

The product of its (nonzero) digits is 1555200, while the sum is 48.

Adding to 251665116030642 its reverse (246030611566152), we get a palindrome (497695727596794).

The spelling of 251665116030642 in words is "two hundred fifty-one trillion, six hundred sixty-five billion, one hundred sixteen million, thirty thousand, six hundred forty-two".