61109169140 has 96 divisors (see below), whose sum is σ = 138592823040. Its totient is φ = 22557312000.

The previous prime is 61109169137. The next prime is 61109169169. The reversal of 61109169140 is 4196190116.

It is a super-2 number, since 2×61109169140² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 61109169094 and 61109169103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11417465 + ... + 11422815.

It is an arithmetic number, because the mean of its divisors is an integer number (1443675240).

Almost surely, 2^61109169140 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 61109169140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69296411520).

61109169140 is an abundant number, since it is smaller than the sum of its proper divisors (77483653900).

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

61109169140 is a wasteful number, since it uses less digits than its factorization.

61109169140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6153 (or 6151 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 61109169140 in words is "sixty-one billion, one hundred nine million, one hundred sixty-nine thousand, one hundred forty".