660898901 has 4 divisors (see below), whose sum is σ = 711737292. Its totient is φ = 610060512.

The previous prime is 660898897. The next prime is 660898939. The reversal of 660898901 is 109898066.

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

It can be written as a sum of positive squares in 2 ways, for example, as 170276401 + 490622500 = 13049^2 + 22150^2 .

It is a cyclic number.

It is not a de Polignac number, because 660898901 - 2² = 660898897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660898801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25419176 + ... + 25419201.

It is an arithmetic number, because the mean of its divisors is an integer number (177934323).

Almost surely, 2^660898901 is an apocalyptic number.

It is an amenable number.

660898901 is a deficient number, since it is larger than the sum of its proper divisors (50838391).

660898901 is a wasteful number, since it uses less digits than its factorization.

660898901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50838390.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 660898901 is about 25707.9540415024. The cubic root of 660898901 is about 871.0538605303.

The spelling of 660898901 in words is "six hundred sixty million, eight hundred ninety-eight thousand, nine hundred one".