61418701818 has 40 divisors (see below), whose sum is σ = 141342952212. Its totient is φ = 19919577024.

The previous prime is 61418701811. The next prime is 61418701819. The reversal of 61418701818 is 81810781416.

61418701818 is a `hidden beast` number, since 614 + 1 + 8 + 7 + 0 + 18 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61287438969 + 131262849 = 247563^2 + 11457^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (61418701811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5117355 + ... + 5129342.

Almost surely, 2^61418701818 is an apocalyptic number.

61418701818 is an abundant number, since it is smaller than the sum of its proper divisors (79924250394).

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

61418701818 is a wasteful number, since it uses less digits than its factorization.

61418701818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10246748 (or 10246739 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 45.

The spelling of 61418701818 in words is "sixty-one billion, four hundred eighteen million, seven hundred one thousand, eight hundred eighteen".