660613567 has 4 divisors (see below), whose sum is σ = 689335920. Its totient is φ = 631891216.

The previous prime is 660613559. The next prime is 660613609. The reversal of 660613567 is 765316066.

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

It is a cyclic number.

It is not a de Polignac number, because 660613567 - 2³ = 660613559 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660613507) 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, 14361142 + ... + 14361187.

It is an arithmetic number, because the mean of its divisors is an integer number (172333980).

Almost surely, 2^660613567 is an apocalyptic number.

660613567 is a deficient number, since it is larger than the sum of its proper divisors (28722353).

660613567 is a wasteful number, since it uses less digits than its factorization.

660613567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28722352.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 660613567 is about 25702.4039148092. The cubic root of 660613567 is about 870.9284873158.

The spelling of 660613567 in words is "six hundred sixty million, six hundred thirteen thousand, five hundred sixty-seven".