61949517217 has 8 divisors (see below), whose sum is σ = 70801984256. Its totient is φ = 53097684192.

The previous prime is 61949517211. The next prime is 61949517241. The reversal of 61949517217 is 71271594916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-61949517217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61949517211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73528 + ... + 359590.

It is an arithmetic number, because the mean of its divisors is an integer number (8850248032).

Almost surely, 2^61949517217 is an apocalyptic number.

It is an amenable number.

61949517217 is a deficient number, since it is larger than the sum of its proper divisors (8852467039).

61949517217 is a wasteful number, since it uses less digits than its factorization.

61949517217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317007.

The product of its digits is 952560, while the sum is 52.

The spelling of 61949517217 in words is "sixty-one billion, nine hundred forty-nine million, five hundred seventeen thousand, two hundred seventeen".