660157115 has 4 divisors (see below), whose sum is σ = 792188544. Its totient is φ = 528125688.

The previous prime is 660157111. The next prime is 660157123. The reversal of 660157115 is 511751066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511751066 = 2 ⋅255875533.

It is a cyclic number.

It is not a de Polignac number, because 660157115 - 2² = 660157111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660157111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66015707 + ... + 66015716.

It is an arithmetic number, because the mean of its divisors is an integer number (198047136).

Almost surely, 2^660157115 is an apocalyptic number.

660157115 is a deficient number, since it is larger than the sum of its proper divisors (132031429).

660157115 is a wasteful number, since it uses less digits than its factorization.

660157115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132031428.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 660157115 is about 25693.5228219098. The cubic root of 660157115 is about 870.7278512887.

The spelling of 660157115 in words is "six hundred sixty million, one hundred fifty-seven thousand, one hundred fifteen".