66722877 has 24 divisors (see below), whose sum is σ = 106603224. Its totient is φ = 39947904.

The previous prime is 66722861. The next prime is 66722891. The reversal of 66722877 is 77822766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23242041 + 43480836 = 4821^2 + 6594^2 .

It is not a de Polignac number, because 66722877 - 2⁴ = 66722861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66722827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3378 + ... + 12035.

It is an arithmetic number, because the mean of its divisors is an integer number (4441801).

Almost surely, 2^66722877 is an apocalyptic number.

It is an amenable number.

66722877 is a deficient number, since it is larger than the sum of its proper divisors (39880347).

66722877 is a wasteful number, since it uses less digits than its factorization.

66722877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15469 (or 15466 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 66722877 is about 8168.4072498866. The cubic root of 66722877 is about 405.5940618915.

The spelling of 66722877 in words is "sixty-six million, seven hundred twenty-two thousand, eight hundred seventy-seven".