117640402251 has 4 divisors (see below), whose sum is σ = 156853869672. Its totient is φ = 78426934832.

The previous prime is 117640402241. The next prime is 117640402283. The reversal of 117640402251 is 152204046711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152204046711 = 3 ⋅50734682237.

It is a cyclic number.

It is not a de Polignac number, because 117640402251 - 2⁵ = 117640402219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117640402211) 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, 19606733706 + ... + 19606733711.

It is an arithmetic number, because the mean of its divisors is an integer number (39213467418).

Almost surely, 2^117640402251 is an apocalyptic number.

117640402251 is a deficient number, since it is larger than the sum of its proper divisors (39213467421).

117640402251 is an equidigital number, since it uses as much as digits as its factorization.

117640402251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39213467420.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 117640402251 its reverse (152204046711), we get a palindrome (269844448962).

The spelling of 117640402251 in words is "one hundred seventeen billion, six hundred forty million, four hundred two thousand, two hundred fifty-one".