18977317727 has 8 divisors (see below), whose sum is σ = 19342558080. Its totient is φ = 18613530520.

The previous prime is 18977317691. The next prime is 18977317729. The reversal of 18977317727 is 72771377981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18977317727 - 2²⁸ = 18708882271 is a prime.

It is a super-2 number, since 2×18977317727² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18977317729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336899 + ... + 389172.

It is an arithmetic number, because the mean of its divisors is an integer number (2417819760).

Almost surely, 2^18977317727 is an apocalyptic number.

18977317727 is a deficient number, since it is larger than the sum of its proper divisors (365240353).

18977317727 is an equidigital number, since it uses as much as digits as its factorization.

18977317727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726573.

The product of its digits is 7260624, while the sum is 59.

The spelling of 18977317727 in words is "eighteen billion, nine hundred seventy-seven million, three hundred seventeen thousand, seven hundred twenty-seven".