61660717 has 4 divisors (see below), whose sum is σ = 65287836. Its totient is φ = 58033600.

The previous prime is 61660657. The next prime is 61660777. The reversal of 61660717 is 71706616.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61660657) and next prime (61660777).

It can be written as a sum of positive squares in 2 ways, for example, as 37197801 + 24462916 = 6099^2 + 4946^2 .

It is a cyclic number.

It is not a de Polignac number, because 61660717 - 2¹⁵ = 61627949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813534 + ... + 1813567.

It is an arithmetic number, because the mean of its divisors is an integer number (16321959).

Almost surely, 2^61660717 is an apocalyptic number.

It is an amenable number.

61660717 is a deficient number, since it is larger than the sum of its proper divisors (3627119).

61660717 is a wasteful number, since it uses less digits than its factorization.

61660717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3627118.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 61660717 is about 7852.4338265279. The cubic root of 61660717 is about 395.0658801615.

The spelling of 61660717 in words is "sixty-one million, six hundred sixty thousand, seven hundred seventeen".