66412057 has 2 divisors, whose sum is σ = 66412058. Its totient is φ = 66412056.

The previous prime is 66412033. The next prime is 66412069. The reversal of 66412057 is 75021466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65221776 + 1190281 = 8076^2 + 1091^2 .

It is a cyclic number.

It is not a de Polignac number, because 66412057 - 2¹⁹ = 65887769 is a prime.

It is a super-2 number, since 2×66412057² = 8821122629942498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66413057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33206028 + 33206029.

It is an arithmetic number, because the mean of its divisors is an integer number (33206029).

Almost surely, 2^66412057 is an apocalyptic number.

It is an amenable number.

66412057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66412057 is an equidigital number, since it uses as much as digits as its factorization.

66412057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 66412057 is about 8149.3592999695. The cubic root of 66412057 is about 404.9632786906.

It can be divided in two parts, 664 and 12057, that added together give a palindrome (12721).

The spelling of 66412057 in words is "sixty-six million, four hundred twelve thousand, fifty-seven".