66427877 has 2 divisors, whose sum is σ = 66427878. Its totient is φ = 66427876.

The previous prime is 66427871. The next prime is 66427901. The reversal of 66427877 is 77872466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39325441 + 27102436 = 6271^2 + 5206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66427877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66427871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33213938 + 33213939.

It is an arithmetic number, because the mean of its divisors is an integer number (33213939).

Almost surely, 2^66427877 is an apocalyptic number.

It is an amenable number.

66427877 is a deficient number, since it is larger than the sum of its proper divisors (1).

66427877 is an equidigital number, since it uses as much as digits as its factorization.

66427877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 47.

The square root of 66427877 is about 8150.3298706249. The cubic root of 66427877 is about 404.9954315392.

The spelling of 66427877 in words is "sixty-six million, four hundred twenty-seven thousand, eight hundred seventy-seven".