61285122774 has 80 divisors (see below), whose sum is σ = 146027529648. Its totient is φ = 19143986688.

The previous prime is 61285122739. The next prime is 61285122793. The reversal of 61285122774 is 47722158216.

61285122774 is a `hidden beast` number, since 6 + 128 + 512 + 2 + 7 + 7 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 593929 + ... + 689435.

Almost surely, 2^61285122774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61285122774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73013764824).

61285122774 is an abundant number, since it is smaller than the sum of its proper divisors (84742406874).

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

61285122774 is a wasteful number, since it uses less digits than its factorization.

61285122774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95771 (or 95762 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The spelling of 61285122774 in words is "sixty-one billion, two hundred eighty-five million, one hundred twenty-two thousand, seven hundred seventy-four".