66601960 has 32 divisors (see below), whose sum is σ = 150098760. Its totient is φ = 26597376.

The previous prime is 66601901. The next prime is 66601967. The reversal of 66601960 is 6910666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36505764 + 30096196 = 6042^2 + 5486^2 .

It is not an unprimeable number, because it can be changed into a prime (66601967) 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, 36592 + ... + 38368.

Almost surely, 2^66601960 is an apocalyptic number.

It is an amenable number.

66601960 is an abundant number, since it is smaller than the sum of its proper divisors (83496800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66601960 is a wasteful number, since it uses less digits than its factorization.

66601960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725 (or 2721 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 66601960 is about 8161.0023894127. The cubic root of 66601960 is about 405.3489042331.

The spelling of 66601960 in words is "sixty-six million, six hundred one thousand, nine hundred sixty".