61780881708 has 384 divisors, whose sum is σ = 204718080000. Its totient is φ = 15673616640.

The previous prime is 61780881697. The next prime is 61780881719. The reversal of 61780881708 is 80718808716.

It is a happy number.

61780881708 is a `hidden beast` number, since 617 + 8 + 0 + 8 + 8 + 17 + 0 + 8 = 666.

61780881708 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61780881697) and next prime (61780881719).

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 60628423 + ... + 60629441.

It is an arithmetic number, because the mean of its divisors is an integer number (533120000).

Almost surely, 2^61780881708 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 61780881708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102359040000).

61780881708 is an abundant number, since it is smaller than the sum of its proper divisors (142937198292).

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

61780881708 is a wasteful number, since it uses less digits than its factorization.

61780881708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 54.

The spelling of 61780881708 in words is "sixty-one billion, seven hundred eighty million, eight hundred eighty-one thousand, seven hundred eight".