18774748723 has 4 divisors (see below), whose sum is σ = 18775265608. Its totient is φ = 18774231840.

The previous prime is 18774748703. The next prime is 18774748739. The reversal of 18774748723 is 32784747781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32784747781 = 71 ⋅461757011.

It is a cyclic number.

It is not a de Polignac number, because 18774748723 - 2⁵ = 18774748691 is a prime.

It is a super-2 number, since 2×18774748723² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18774748703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199473 + ... + 278098.

It is an arithmetic number, because the mean of its divisors is an integer number (4693816402).

Almost surely, 2^18774748723 is an apocalyptic number.

18774748723 is a deficient number, since it is larger than the sum of its proper divisors (516885).

18774748723 is an equidigital number, since it uses as much as digits as its factorization.

18774748723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516884.

The product of its digits is 14751744, while the sum is 58.

The spelling of 18774748723 in words is "eighteen billion, seven hundred seventy-four million, seven hundred forty-eight thousand, seven hundred twenty-three".