251552161667 has 4 divisors (see below), whose sum is σ = 251554588560. Its totient is φ = 251549734776.

The previous prime is 251552161639. The next prime is 251552161697. The reversal of 251552161667 is 766161255152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251552161667 - 2³⁰ = 250478419843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251552161697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050692 + ... + 1267697.

It is an arithmetic number, because the mean of its divisors is an integer number (62888647140).

Almost surely, 2^251552161667 is an apocalyptic number.

251552161667 is a deficient number, since it is larger than the sum of its proper divisors (2426893).

251552161667 is a wasteful number, since it uses less digits than its factorization.

251552161667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426892.

The product of its digits is 756000, while the sum is 47.

The spelling of 251552161667 in words is "two hundred fifty-one billion, five hundred fifty-two million, one hundred sixty-one thousand, six hundred sixty-seven".