66743437 has 2 divisors, whose sum is σ = 66743438. Its totient is φ = 66743436.

The previous prime is 66743423. The next prime is 66743461. The reversal of 66743437 is 73434766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43837641 + 22905796 = 6621^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 66743437 - 2¹⁹ = 66219149 is a prime.

It is equal to p_3937558 and since 66743437 and 3937558 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66743437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66743137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33371718 + 33371719.

It is an arithmetic number, because the mean of its divisors is an integer number (33371719).

Almost surely, 2^66743437 is an apocalyptic number.

It is an amenable number.

66743437 is a deficient number, since it is larger than the sum of its proper divisors (1).

66743437 is an equidigital number, since it uses as much as digits as its factorization.

66743437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 40.

The square root of 66743437 is about 8169.6656602336. The cubic root of 66743437 is about 405.6357175570.

The spelling of 66743437 in words is "sixty-six million, seven hundred forty-three thousand, four hundred thirty-seven".