65401818192 has 120 divisors (see below), whose sum is σ = 194132099304. Its totient is φ = 20483162112.

The previous prime is 65401818191. The next prime is 65401818211. The reversal of 65401818192 is 29181810456.

It is a happy number.

65401818192 is a `hidden beast` number, since 6 + 5 + 401 + 81 + 81 + 92 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26798999616 + 38602818576 = 163704^2 + 196476^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65401818191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1429138 + ... + 1474190.

Almost surely, 2^65401818192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65401818192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97066049652).

65401818192 is an abundant number, since it is smaller than the sum of its proper divisors (128730281112).

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

65401818192 is a wasteful number, since it uses less digits than its factorization.

65401818192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45677 (or 45668 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 65401818192 in words is "sixty-five billion, four hundred one million, eight hundred eighteen thousand, one hundred ninety-two".