18724394051 has 4 divisors (see below), whose sum is σ = 20426611704. Its totient is φ = 17022176400.

The previous prime is 18724394027. The next prime is 18724394057. The reversal of 18724394051 is 15049342781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18724394051 - 2³⁴ = 1544524867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18724393993 and 18724394011.

It is not an unprimeable number, because it can be changed into a prime (18724394057) 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, 851108810 + ... + 851108831.

It is an arithmetic number, because the mean of its divisors is an integer number (5106652926).

Almost surely, 2^18724394051 is an apocalyptic number.

18724394051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18724394051 is a deficient number, since it is larger than the sum of its proper divisors (1702217653).

18724394051 is a wasteful number, since it uses less digits than its factorization.

18724394051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702217652.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 18724394051 in words is "eighteen billion, seven hundred twenty-four million, three hundred ninety-four thousand, fifty-one".