18947360709 has 48 divisors (see below), whose sum is σ = 29564196480. Its totient is φ = 11654046720.

The previous prime is 18947360687. The next prime is 18947360741. The reversal of 18947360709 is 90706374981.

It is a happy number.

It is not a de Polignac number, because 18947360709 - 2⁷ = 18947360581 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947360009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4534029 + ... + 4538205.

It is an arithmetic number, because the mean of its divisors is an integer number (615920760).

Almost surely, 2^18947360709 is an apocalyptic number.

18947360709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18947360709 is a deficient number, since it is larger than the sum of its proper divisors (10616835771).

18947360709 is a wasteful number, since it uses less digits than its factorization.

18947360709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4890 (or 4887 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 18947360709 in words is "eighteen billion, nine hundred forty-seven million, three hundred sixty thousand, seven hundred nine".