18667774040831 has 16 divisors (see below), whose sum is σ = 19781671553568. Its totient is φ = 17555635200000.

The previous prime is 18667774040813. The next prime is 18667774040911. The reversal of 18667774040831 is 13804047776681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18667774040831 is a prime.

It is a super-2 number, since 2×18667774040831² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18667774040131) 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, 164415581 + ... + 164529081.

It is an arithmetic number, because the mean of its divisors is an integer number (1236354472098).

Almost surely, 2^{18667774040831} is an apocalyptic number.

18667774040831 is a deficient number, since it is larger than the sum of its proper divisors (1113897512737).

18667774040831 is a wasteful number, since it uses less digits than its factorization.

18667774040831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121162.

The product of its (nonzero) digits is 37933056, while the sum is 62.

The spelling of 18667774040831 in words is "eighteen trillion, six hundred sixty-seven billion, seven hundred seventy-four million, forty thousand, eight hundred thirty-one".