18434957971 has 4 divisors (see below), whose sum is σ = 18435336112. Its totient is φ = 18434579832.

The previous prime is 18434957899. The next prime is 18434958001. The reversal of 18434957971 is 17975943481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17975943481 = 15101 ⋅1190381.

It is a cyclic number.

It is not a de Polignac number, because 18434957971 - 2²¹ = 18432860819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18434957371) 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, 102831 + ... + 217816.

It is an arithmetic number, because the mean of its divisors is an integer number (4608834028).

Almost surely, 2^18434957971 is an apocalyptic number.

18434957971 is a deficient number, since it is larger than the sum of its proper divisors (378141).

18434957971 is an equidigital number, since it uses as much as digits as its factorization.

18434957971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378140.

The product of its digits is 7620480, while the sum is 58.

The spelling of 18434957971 in words is "eighteen billion, four hundred thirty-four million, nine hundred fifty-seven thousand, nine hundred seventy-one".