61696185720 has 128 divisors (see below), whose sum is σ = 206199604800. Its totient is φ = 14663061504.

The previous prime is 61696185703. The next prime is 61696185721. The reversal of 61696185720 is 2758169616.

61696185720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61696185721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636637 + ... + 727116.

Almost surely, 2^61696185720 is an apocalyptic number.

61696185720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61696185720 is an abundant number, since it is smaller than the sum of its proper divisors (144503419080).

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

61696185720 is a wasteful number, since it uses less digits than its factorization.

61696185720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363809 (or 1363805 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 61696185720 in words is "sixty-one billion, six hundred ninety-six million, one hundred eighty-five thousand, seven hundred twenty".