660910997 has 8 divisors (see below), whose sum is σ = 665390592. Its totient is φ = 656442400.

The previous prime is 660910969. The next prime is 660911011. The reversal of 660910997 is 799019066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660910997 - 2⁸ = 660910741 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 (660910967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143078 + ... + 147624.

It is an arithmetic number, because the mean of its divisors is an integer number (83173824).

Almost surely, 2^660910997 is an apocalyptic number.

It is an amenable number.

660910997 is a deficient number, since it is larger than the sum of its proper divisors (4479595).

660910997 is a wasteful number, since it uses less digits than its factorization.

660910997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 660910997 is about 25708.1892983539. The cubic root of 660910997 is about 871.0591746074.

The spelling of 660910997 in words is "six hundred sixty million, nine hundred ten thousand, nine hundred ninety-seven".