18379815277 has 4 divisors (see below), whose sum is σ = 18972712576. Its totient is φ = 17786917980.

The previous prime is 18379815271. The next prime is 18379815283. The reversal of 18379815277 is 77251897381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18379815271) and next prime (18379815283).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18379815277 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 (18379815271) 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, 296448603 + ... + 296448664.

It is an arithmetic number, because the mean of its divisors is an integer number (4743178144).

Almost surely, 2^18379815277 is an apocalyptic number.

It is an amenable number.

18379815277 is a deficient number, since it is larger than the sum of its proper divisors (592897299).

18379815277 is an equidigital number, since it uses as much as digits as its factorization.

18379815277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592897298.

The product of its digits is 5927040, while the sum is 58.

The spelling of 18379815277 in words is "eighteen billion, three hundred seventy-nine million, eight hundred fifteen thousand, two hundred seventy-seven".