18614795977 has 4 divisors (see below), whose sum is σ = 18615115156. Its totient is φ = 18614476800.

The previous prime is 18614795971. The next prime is 18614795981. The reversal of 18614795977 is 77959741681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77959741681 = 19 ⋅4103144299.

It can be written as a sum of positive squares in 2 ways, for example, as 18121467456 + 493328521 = 134616^2 + 22211^2 .

It is a cyclic number.

It is not a de Polignac number, because 18614795977 - 2¹¹ = 18614793929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18614795971) 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, 44388 + ... + 197989.

It is an arithmetic number, because the mean of its divisors is an integer number (4653778789).

Almost surely, 2^18614795977 is an apocalyptic number.

It is an amenable number.

18614795977 is a deficient number, since it is larger than the sum of its proper divisors (319179).

18614795977 is an equidigital number, since it uses as much as digits as its factorization.

18614795977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319178.

The product of its digits is 26671680, while the sum is 64.

The spelling of 18614795977 in words is "eighteen billion, six hundred fourteen million, seven hundred ninety-five thousand, nine hundred seventy-seven".