66155941 has 2 divisors, whose sum is σ = 66155942. Its totient is φ = 66155940.

The previous prime is 66155927. The next prime is 66156017. The reversal of 66155941 is 14955166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41860900 + 24295041 = 6470^2 + 4929^2 .

It is a cyclic number.

It is not a de Polignac number, because 66155941 - 2²¹ = 64058789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66155941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66155911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33077970 + 33077971.

It is an arithmetic number, because the mean of its divisors is an integer number (33077971).

Almost surely, 2^66155941 is an apocalyptic number.

It is an amenable number.

66155941 is a deficient number, since it is larger than the sum of its proper divisors (1).

66155941 is an equidigital number, since it uses as much as digits as its factorization.

66155941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 66155941 is about 8133.6302473127. The cubic root of 66155941 is about 404.4420320274.

The spelling of 66155941 in words is "sixty-six million, one hundred fifty-five thousand, nine hundred forty-one".