61222508217 has 24 divisors (see below), whose sum is σ = 98518984200. Its totient is φ = 36376236288.

The previous prime is 61222508213. The next prime is 61222508231. The reversal of 61222508217 is 71280522216.

It is a happy number.

61222508217 is a `hidden beast` number, since 6 + 122 + 2 + 508 + 21 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1283717241 + 59938790976 = 35829^2 + 244824^2 .

It is not a de Polignac number, because 61222508217 - 2² = 61222508213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61222508213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9018492 + ... + 9025277.

It is an arithmetic number, because the mean of its divisors is an integer number (4104957675).

Almost surely, 2^61222508217 is an apocalyptic number.

It is an amenable number.

61222508217 is a deficient number, since it is larger than the sum of its proper divisors (37296475983).

61222508217 is a wasteful number, since it uses less digits than its factorization.

61222508217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18043817 (or 18043814 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 61222508217 in words is "sixty-one billion, two hundred twenty-two million, five hundred eight thousand, two hundred seventeen".