61171981280 has 96 divisors (see below), whose sum is σ = 159673114944. Its totient is φ = 22028148736.

The previous prime is 61171981253. The next prime is 61171981301. The reversal of 61171981280 is 8218917116.

It is a happy number.

61171981280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61171981280² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426347 + ... + 551466.

It is an arithmetic number, because the mean of its divisors is an integer number (1663261614).

Almost surely, 2^61171981280 is an apocalyptic number.

It is an amenable number.

61171981280 is an abundant number, since it is smaller than the sum of its proper divisors (98501133664).

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

61171981280 is a wasteful number, since it uses less digits than its factorization.

61171981280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977868 (or 977860 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 44.

The spelling of 61171981280 in words is "sixty-one billion, one hundred seventy-one million, nine hundred eighty-one thousand, two hundred eighty".