61217309960 has 32 divisors (see below), whose sum is σ = 137753490240. Its totient is φ = 24484338624.

The previous prime is 61217309957. The next prime is 61217309987. The reversal of 61217309960 is 6990371216.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328379 + ... + 479861.

It is an arithmetic number, because the mean of its divisors is an integer number (4304796570).

Almost surely, 2^61217309960 is an apocalyptic number.

It is an amenable number.

61217309960 is an abundant number, since it is smaller than the sum of its proper divisors (76536180280).

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

61217309960 is a wasteful number, since it uses less digits than its factorization.

61217309960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161597 (or 161593 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 61217309960 in words is "sixty-one billion, two hundred seventeen million, three hundred nine thousand, nine hundred sixty".