18657343386551 has 16 divisors (see below), whose sum is σ = 19006696811520. Its totient is φ = 18311123297280.

The previous prime is 18657343386481. The next prime is 18657343386593. The reversal of 18657343386551 is 15568334375681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18657343386551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18657343386751) 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, 123207755 + ... + 123359091.

It is an arithmetic number, because the mean of its divisors is an integer number (1187918550720).

Almost surely, 2^{18657343386551} is an apocalyptic number.

18657343386551 is a deficient number, since it is larger than the sum of its proper divisors (349353424969).

18657343386551 is a wasteful number, since it uses less digits than its factorization.

18657343386551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161674.

The product of its digits is 217728000, while the sum is 65.

The spelling of 18657343386551 in words is "eighteen trillion, six hundred fifty-seven billion, three hundred forty-three million, three hundred eighty-six thousand, five hundred fifty-one".