61655617 has 16 divisors (see below), whose sum is σ = 68677632. Its totient is φ = 55052800.

The previous prime is 61655603. The next prime is 61655623. The reversal of 61655617 is 71655616.

It is not a de Polignac number, because 61655617 - 2¹¹ = 61653569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61655317) 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, 52992 + ... + 54142.

It is an arithmetic number, because the mean of its divisors is an integer number (4292352).

Almost surely, 2^61655617 is an apocalyptic number.

It is an amenable number.

61655617 is a deficient number, since it is larger than the sum of its proper divisors (7022015).

61655617 is a wasteful number, since it uses less digits than its factorization.

61655617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328.

The product of its digits is 37800, while the sum is 37.

The square root of 61655617 is about 7852.1090797314. The cubic root of 61655617 is about 395.0549878049.

Subtracting 61655617 from its reverse (71655616), we obtain a palindrome (9999999).

The spelling of 61655617 in words is "sixty-one million, six hundred fifty-five thousand, six hundred seventeen".