66733949 has 4 divisors (see below), whose sum is σ = 67159164. Its totient is φ = 66308736.

The previous prime is 66733861. The next prime is 66733967. The reversal of 66733949 is 94933766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35485849 + 31248100 = 5957^2 + 5590^2 .

It is a cyclic number.

It is not a de Polignac number, because 66733949 - 2¹² = 66729853 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 (66733969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212372 + ... + 212685.

It is an arithmetic number, because the mean of its divisors is an integer number (16789791).

Almost surely, 2^66733949 is an apocalyptic number.

It is an amenable number.

66733949 is a deficient number, since it is larger than the sum of its proper divisors (425215).

66733949 is a wasteful number, since it uses less digits than its factorization.

66733949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425214.

The product of its digits is 734832, while the sum is 47.

The square root of 66733949 is about 8169.0849548771. The cubic root of 66733949 is about 405.6164954220.

The spelling of 66733949 in words is "sixty-six million, seven hundred thirty-three thousand, nine hundred forty-nine".