61256265217 has 16 divisors (see below), whose sum is σ = 74429280000. Its totient is φ = 49274926272.

The previous prime is 61256265199. The next prime is 61256265241. The reversal of 61256265217 is 71256265216.

It is a cyclic number.

It is not a de Polignac number, because 61256265217 - 2⁷ = 61256265089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61256262217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3580842 + ... + 3597907.

It is an arithmetic number, because the mean of its divisors is an integer number (4651830000).

Almost surely, 2^61256265217 is an apocalyptic number.

It is an amenable number.

61256265217 is a deficient number, since it is larger than the sum of its proper divisors (13173014783).

61256265217 is a wasteful number, since it uses less digits than its factorization.

61256265217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7178832.

The product of its digits is 302400, while the sum is 43.

Subtracting 61256265217 from its reverse (71256265216), we obtain a palindrome (9999999999).

The spelling of 61256265217 in words is "sixty-one billion, two hundred fifty-six million, two hundred sixty-five thousand, two hundred seventeen".