61078385664 has 110 divisors (see below), whose sum is σ = 182392248434. Its totient is φ = 20359434240.

The previous prime is 61078385657. The next prime is 61078385677. The reversal of 61078385664 is 46658387016.

61078385664 is a `hidden beast` number, since 6 + 1 + 0 + 78 + 3 + 8 + 566 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 34506777600 + 26571608064 = 185760^2 + 163008^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 61078385664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 285247 + ... + 451134.

Almost surely, 2^61078385664 is an apocalyptic number.

61078385664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61078385664 is an abundant number, since it is smaller than the sum of its proper divisors (121313862770).

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

61078385664 is an equidigital number, since it uses as much as digits as its factorization.

61078385664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736413 (or 736386 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 61078385664 in words is "sixty-one billion, seventy-eight million, three hundred eighty-five thousand, six hundred sixty-four".