660155878 has 4 divisors (see below), whose sum is σ = 990233820. Its totient is φ = 330077938.

The previous prime is 660155861. The next prime is 660155879. The reversal of 660155878 is 878551066.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660155879) 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 as a sum of consecutive naturals, namely, 165038968 + ... + 165038971.

It is an arithmetic number, because the mean of its divisors is an integer number (247558455).

Almost surely, 2^660155878 is an apocalyptic number.

660155878 is a deficient number, since it is larger than the sum of its proper divisors (330077942).

660155878 is a wasteful number, since it uses less digits than its factorization.

660155878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330077941.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 660155878 is about 25693.4987496837. The cubic root of 660155878 is about 870.7273074328.

The spelling of 660155878 in words is "six hundred sixty million, one hundred fifty-five thousand, eight hundred seventy-eight".