660815097 has 8 divisors (see below), whose sum is σ = 883612800. Its totient is φ = 439280400.

The previous prime is 660815087. The next prime is 660815123. The reversal of 660815097 is 790518066.

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

It is not a de Polignac number, because 660815097 - 2⁶ = 660815033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660815017) 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, 314529 + ... + 316622.

It is an arithmetic number, because the mean of its divisors is an integer number (110451600).

Almost surely, 2^660815097 is an apocalyptic number.

It is an amenable number.

660815097 is a deficient number, since it is larger than the sum of its proper divisors (222797703).

660815097 is a wasteful number, since it uses less digits than its factorization.

660815097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631503.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 660815097 is about 25706.3240662682. The cubic root of 660815097 is about 871.0170415436.

The spelling of 660815097 in words is "six hundred sixty million, eight hundred fifteen thousand, ninety-seven".