66719601 has 12 divisors (see below), whose sum is σ = 103786228. Its totient is φ = 41058144.

The previous prime is 66719581. The next prime is 66719647. The reversal of 66719601 is 10691766.

It can be written as a sum of positive squares in 2 ways, for example, as 27029601 + 39690000 = 5199^2 + 6300^2 .

It is not a de Polignac number, because 66719601 - 2²¹ = 64622449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66715601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285010 + ... + 285243.

Almost surely, 2^66719601 is an apocalyptic number.

It is an amenable number.

66719601 is a deficient number, since it is larger than the sum of its proper divisors (37066627).

66719601 is a wasteful number, since it uses less digits than its factorization.

66719601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570272 (or 570269 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 66719601 is about 8168.2067187358. The cubic root of 66719601 is about 405.5874237490.

The spelling of 66719601 in words is "sixty-six million, seven hundred nineteen thousand, six hundred one".