66811941 has 48 divisors (see below), whose sum is σ = 117561600. Its totient is φ = 36479520.

The previous prime is 66811937. The next prime is 66811967. The reversal of 66811941 is 14911866.

It is a happy number.

It is not a de Polignac number, because 66811941 - 2² = 66811937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66811896 and 66811905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66811741) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70531 + ... + 71471.

It is an arithmetic number, because the mean of its divisors is an integer number (2449200).

Almost surely, 2^66811941 is an apocalyptic number.

It is an amenable number.

66811941 is a deficient number, since it is larger than the sum of its proper divisors (50749659).

66811941 is a wasteful number, since it uses less digits than its factorization.

66811941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 974 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 66811941 is about 8173.8571678247. The cubic root of 66811941 is about 405.7744486392.

The spelling of 66811941 in words is "sixty-six million, eight hundred eleven thousand, nine hundred forty-one".