1518718438668 has 12 divisors (see below), whose sum is σ = 3543676356920. Its totient is φ = 506239479552.

The previous prime is 1518718438667. The next prime is 1518718438669. The reversal of 1518718438668 is 8668348178151.

It is an interprime number because it is at equal distance from previous prime (1518718438667) and next prime (1518718438669).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1518718438668² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1518718438599 and 1518718438608.

It is not an unprimeable number, because it can be changed into a prime (1518718438663) 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, 63279934933 + ... + 63279934956.

Almost surely, 2^{1518718438668} is an apocalyptic number.

It is an amenable number.

1518718438668 is an abundant number, since it is smaller than the sum of its proper divisors (2024957918252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1518718438668 is a wasteful number, since it uses less digits than its factorization.

1518718438668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126559869896 (or 126559869894 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 66.

The spelling of 1518718438668 in words is "one trillion, five hundred eighteen billion, seven hundred eighteen million, four hundred thirty-eight thousand, six hundred sixty-eight".