18642914641 has 16 divisors (see below), whose sum is σ = 20192578560. Its totient is φ = 17110025280.

The previous prime is 18642914617. The next prime is 18642914651. The reversal of 18642914641 is 14641924681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18642914641 is a prime.

It is a super-2 number, since 2×18642914641² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18642914591 and 18642914600.

It is not an unprimeable number, because it can be changed into a prime (18642914651) 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, 1844640 + ... + 1854718.

It is an arithmetic number, because the mean of its divisors is an integer number (1262036160).

Almost surely, 2^18642914641 is an apocalyptic number.

It is an amenable number.

18642914641 is a deficient number, since it is larger than the sum of its proper divisors (1549663919).

18642914641 is a wasteful number, since it uses less digits than its factorization.

18642914641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10896.

The product of its digits is 331776, while the sum is 46.

The spelling of 18642914641 in words is "eighteen billion, six hundred forty-two million, nine hundred fourteen thousand, six hundred forty-one".