66477877 has 2 divisors, whose sum is σ = 66477878. Its totient is φ = 66477876.

The previous prime is 66477833. The next prime is 66477893. The reversal of 66477877 is 77877466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64738116 + 1739761 = 8046^2 + 1319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66477877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66477577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33238938 + 33238939.

It is an arithmetic number, because the mean of its divisors is an integer number (33238939).

Almost surely, 2^66477877 is an apocalyptic number.

It is an amenable number.

66477877 is a deficient number, since it is larger than the sum of its proper divisors (1).

66477877 is an equidigital number, since it uses as much as digits as its factorization.

66477877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 52.

The square root of 66477877 is about 8153.3966541559. The cubic root of 66477877 is about 405.0970188746.

The spelling of 66477877 in words is "sixty-six million, four hundred seventy-seven thousand, eight hundred seventy-seven".