61181135862 has 96 divisors (see below), whose sum is σ = 156612185856. Its totient is φ = 15591301440.

The previous prime is 61181135861. The next prime is 61181135909. The reversal of 61181135862 is 26853118116.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61181135861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155773 + ... + 382919.

It is an arithmetic number, because the mean of its divisors is an integer number (1631376936).

Almost surely, 2^61181135862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61181135862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78306092928).

61181135862 is an abundant number, since it is smaller than the sum of its proper divisors (95431049994).

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

61181135862 is a wasteful number, since it uses less digits than its factorization.

61181135862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227234 (or 227223 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The spelling of 61181135862 in words is "sixty-one billion, one hundred eighty-one million, one hundred thirty-five thousand, eight hundred sixty-two".