61666078080 has 128 divisors (see below), whose sum is σ = 196744658400. Its totient is φ = 16428892160.

The previous prime is 61666078051. The next prime is 61666078087. The reversal of 61666078080 is 8087066616.

61666078080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61666078087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2114800 + ... + 2143760.

Almost surely, 2^61666078080 is an apocalyptic number.

61666078080 is a gapful number since it is divisible by the number (60) 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 61666078080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98372329200).

61666078080 is an abundant number, since it is smaller than the sum of its proper divisors (135078580320).

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

61666078080 is a wasteful number, since it uses less digits than its factorization.

61666078080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30092 (or 30080 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 61666078080 in words is "sixty-one billion, six hundred sixty-six million, seventy-eight thousand, eighty".