61061784144 has 20 divisors (see below), whose sum is σ = 157742942496. Its totient is φ = 20353928032.

The previous prime is 61061784139. The next prime is 61061784149. The reversal of 61061784144 is 44148716016.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61061784139) and next prime (61061784149).

It is a junction number, because it is equal to n+sod(n) for n = 61061784096 and 61061784105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61061784149) 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, 636060204 + ... + 636060299.

Almost surely, 2^61061784144 is an apocalyptic number.

It is an amenable number.

61061784144 is an abundant number, since it is smaller than the sum of its proper divisors (96681158352).

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

61061784144 is a wasteful number, since it uses less digits than its factorization.

61061784144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272120514 (or 1272120508 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The spelling of 61061784144 in words is "sixty-one billion, sixty-one million, seven hundred eighty-four thousand, one hundred forty-four".