18642478757 has 4 divisors (see below), whose sum is σ = 21305690016. Its totient is φ = 15979267500.

The previous prime is 18642478753. The next prime is 18642478759. The reversal of 18642478757 is 75787424681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18642478757 - 2² = 18642478753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18642478696 and 18642478705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18642478753) 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, 1331605619 + ... + 1331605632.

It is an arithmetic number, because the mean of its divisors is an integer number (5326422504).

Almost surely, 2^18642478757 is an apocalyptic number.

It is an amenable number.

18642478757 is a deficient number, since it is larger than the sum of its proper divisors (2663211259).

18642478757 is an equidigital number, since it uses as much as digits as its factorization.

18642478757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663211258.

The product of its digits is 21073920, while the sum is 59.

The spelling of 18642478757 in words is "eighteen billion, six hundred forty-two million, four hundred seventy-eight thousand, seven hundred fifty-seven".