18977350947 has 8 divisors (see below), whose sum is σ = 25311910656. Its totient is φ = 12647179272.

The previous prime is 18977350939. The next prime is 18977350961. The reversal of 18977350947 is 74905377981.

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

It is not a de Polignac number, because 18977350947 - 2³ = 18977350939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18977330947) 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, 1086903 + ... + 1104224.

It is an arithmetic number, because the mean of its divisors is an integer number (3163988832).

Almost surely, 2^18977350947 is an apocalyptic number.

18977350947 is a deficient number, since it is larger than the sum of its proper divisors (6334559709).

18977350947 is a wasteful number, since it uses less digits than its factorization.

18977350947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194017.

The product of its (nonzero) digits is 13335840, while the sum is 60.

The spelling of 18977350947 in words is "eighteen billion, nine hundred seventy-seven million, three hundred fifty thousand, nine hundred forty-seven".