61717567 has 4 divisors (see below), whose sum is σ = 64965880. Its totient is φ = 58469256.

The previous prime is 61717553. The next prime is 61717571. The reversal of 61717567 is 76571716.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61717567 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 (61717547) 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, 1624128 + ... + 1624165.

It is an arithmetic number, because the mean of its divisors is an integer number (16241470).

Almost surely, 2^61717567 is an apocalyptic number.

61717567 is a deficient number, since it is larger than the sum of its proper divisors (3248313).

61717567 is a wasteful number, since it uses less digits than its factorization.

61717567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3248312.

The product of its digits is 61740, while the sum is 40.

The square root of 61717567 is about 7856.0528893332. The cubic root of 61717567 is about 395.1872572581.

The spelling of 61717567 in words is "sixty-one million, seven hundred seventeen thousand, five hundred sixty-seven".