66641236 has 12 divisors (see below), whose sum is σ = 119466900. Its totient is φ = 32507840.

The previous prime is 66641221. The next prime is 66641249. The reversal of 66641236 is 63214666.

It can be written as a sum of positive squares in 2 ways, for example, as 9548100 + 57093136 = 3090^2 + 7556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203011 + ... + 203338.

It is an arithmetic number, because the mean of its divisors is an integer number (9955575).

Almost surely, 2^66641236 is an apocalyptic number.

It is an amenable number.

66641236 is a deficient number, since it is larger than the sum of its proper divisors (52825664).

66641236 is a wasteful number, since it uses less digits than its factorization.

66641236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406394 (or 406392 counting only the distinct ones).

The product of its digits is 31104, while the sum is 34.

The square root of 66641236 is about 8163.4083568078. The cubic root of 66641236 is about 405.4285683305.

The spelling of 66641236 in words is "sixty-six million, six hundred forty-one thousand, two hundred thirty-six".