18977066667 has 32 divisors (see below), whose sum is σ = 30728732160. Its totient is φ = 11503879200.

The previous prime is 18977066657. The next prime is 18977066681. The reversal of 18977066667 is 76666077981.

It is not a de Polignac number, because 18977066667 - 2¹⁹ = 18976542379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18977066617) 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 31 ways as a sum of consecutive naturals, for example, 379959 + ... + 426992.

It is an arithmetic number, because the mean of its divisors is an integer number (960272880).

Almost surely, 2^18977066667 is an apocalyptic number.

18977066667 is a deficient number, since it is larger than the sum of its proper divisors (11751665493).

18977066667 is a wasteful number, since it uses less digits than its factorization.

18977066667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807040 (or 807034 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 63.

The spelling of 18977066667 in words is "eighteen billion, nine hundred seventy-seven million, sixty-six thousand, six hundred sixty-seven".