61041378816 has 640 divisors, whose sum is σ = 212694958080. Its totient is φ = 17091993600.

The previous prime is 61041378773. The next prime is 61041378823. The reversal of 61041378816 is 61887314016.

61041378816 is a `hidden beast` number, since 610 + 4 + 13 + 7 + 8 + 8 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 108421351 + ... + 108421913.

It is an arithmetic number, because the mean of its divisors is an integer number (332335872).

Almost surely, 2^61041378816 is an apocalyptic number.

61041378816 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61041378816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106347479040).

61041378816 is an abundant number, since it is smaller than the sum of its proper divisors (151653579264).

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

61041378816 is a wasteful number, since it uses less digits than its factorization.

61041378816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 61041378816 in words is "sixty-one billion, forty-one million, three hundred seventy-eight thousand, eight hundred sixteen".