18977577969 has 8 divisors (see below), whose sum is σ = 28918214080. Its totient is φ = 10844330256.

The previous prime is 18977577959. The next prime is 18977578007. The reversal of 18977577969 is 96977577981.

It is a happy number.

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

It is not a de Polignac number, because 18977577969 - 2⁵ = 18977577937 is a prime.

It is a super-2 number, since 2×18977577969² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18977577969.

It is not an unprimeable number, because it can be changed into a prime (18977577959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451847074 + ... + 451847115.

It is an arithmetic number, because the mean of its divisors is an integer number (3614776760).

Almost surely, 2^18977577969 is an apocalyptic number.

It is an amenable number.

18977577969 is a deficient number, since it is larger than the sum of its proper divisors (9940636111).

18977577969 is an equidigital number, since it uses as much as digits as its factorization.

18977577969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903694199.

The product of its digits is 420078960, while the sum is 75.

The spelling of 18977577969 in words is "eighteen billion, nine hundred seventy-seven million, five hundred seventy-seven thousand, nine hundred sixty-nine".