18774739478 has 16 divisors (see below), whose sum is σ = 30946556304. Its totient is φ = 8471679360.

The previous prime is 18774739471. The next prime is 18774739493. The reversal of 18774739478 is 87493747781.

It is a super-3 number, since 3×18774739478³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18774739471) 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, 3111575 + ... + 3117602.

It is an arithmetic number, because the mean of its divisors is an integer number (1934159769).

Almost surely, 2^18774739478 is an apocalyptic number.

18774739478 is a deficient number, since it is larger than the sum of its proper divisors (12171816826).

18774739478 is a wasteful number, since it uses less digits than its factorization.

18774739478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6229327.

The product of its digits is 66382848, while the sum is 65.

The spelling of 18774739478 in words is "eighteen billion, seven hundred seventy-four million, seven hundred thirty-nine thousand, four hundred seventy-eight".