18744746657 has 16 divisors (see below), whose sum is σ = 23814669312. Its totient is φ = 14352586560.

The previous prime is 18744746653. The next prime is 18744746729. The reversal of 18744746657 is 75664744781.

It is not a de Polignac number, because 18744746657 - 2² = 18744746653 is a prime.

It is a super-2 number, since 2×18744746657² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18744746596 and 18744746605.

It is not an unprimeable number, because it can be changed into a prime (18744746653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3319538 + ... + 3325179.

It is an arithmetic number, because the mean of its divisors is an integer number (1488416832).

Almost surely, 2^18744746657 is an apocalyptic number.

It is an amenable number.

18744746657 is a deficient number, since it is larger than the sum of its proper divisors (5069922655).

18744746657 is a wasteful number, since it uses less digits than its factorization.

18744746657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6644768.

The product of its digits is 31610880, while the sum is 59.

The spelling of 18744746657 in words is "eighteen billion, seven hundred forty-four million, seven hundred forty-six thousand, six hundred fifty-seven".