61170778656 has 576 divisors, whose sum is σ = 204287795712. Its totient is φ = 17211211776.

The previous prime is 61170778631. The next prime is 61170778667. The reversal of 61170778656 is 65687707116.

It is a super-2 number, since 2×61170778656² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 232588381 + ... + 232588643.

It is an arithmetic number, because the mean of its divisors is an integer number (354666312).

Almost surely, 2^61170778656 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 61170778656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102143897856).

61170778656 is an abundant number, since it is smaller than the sum of its proper divisors (143117017056).

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

61170778656 is a wasteful number, since it uses less digits than its factorization.

61170778656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 61170778656 in words is "sixty-one billion, one hundred seventy million, seven hundred seventy-eight thousand, six hundred fifty-six".