66772349 has 6 divisors (see below), whose sum is σ = 77674014. Its totient is φ = 57233400.

The previous prime is 66772337. The next prime is 66772367. The reversal of 66772349 is 94327766.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66504025 + 268324 = 8155^2 + 518^2 .

It is not a de Polignac number, because 66772349 - 2⁴ = 66772333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66772319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 681302 + ... + 681399.

It is an arithmetic number, because the mean of its divisors is an integer number (12945669).

Almost surely, 2^66772349 is an apocalyptic number.

It is an amenable number.

66772349 is a deficient number, since it is larger than the sum of its proper divisors (10901665).

66772349 is a wasteful number, since it uses less digits than its factorization.

66772349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362715 (or 1362708 counting only the distinct ones).

The product of its digits is 381024, while the sum is 44.

The square root of 66772349 is about 8171.4349413062. The cubic root of 66772349 is about 405.6942803530.

The spelling of 66772349 in words is "sixty-six million, seven hundred seventy-two thousand, three hundred forty-nine".