139665422671 has 4 divisors (see below), whose sum is σ = 139668262200. Its totient is φ = 139662583144.

The previous prime is 139665422641. The next prime is 139665422681. The reversal of 139665422671 is 176224566931.

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 139665422671 - 2²¹ = 139663325519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139665422641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344661 + ... + 1444798.

It is an arithmetic number, because the mean of its divisors is an integer number (34917065550).

Almost surely, 2^139665422671 is an apocalyptic number.

139665422671 is a deficient number, since it is larger than the sum of its proper divisors (2839529).

139665422671 is an equidigital number, since it uses as much as digits as its factorization.

139665422671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839528.

The product of its digits is 3265920, while the sum is 52.

The spelling of 139665422671 in words is "one hundred thirty-nine billion, six hundred sixty-five million, four hundred twenty-two thousand, six hundred seventy-one".