61217356220 has 12 divisors (see below), whose sum is σ = 128556448104. Its totient is φ = 24486942480.

The previous prime is 61217356177. The next prime is 61217356241. The reversal of 61217356220 is 2265371216.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530433886 + ... + 1530433925.

It is an arithmetic number, because the mean of its divisors is an integer number (10713037342).

Almost surely, 2^61217356220 is an apocalyptic number.

It is an amenable number.

61217356220 is an abundant number, since it is smaller than the sum of its proper divisors (67339091884).

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

61217356220 is a wasteful number, since it uses less digits than its factorization.

61217356220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060867820 (or 3060867818 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 61217356220 in words is "sixty-one billion, two hundred seventeen million, three hundred fifty-six thousand, two hundred twenty".