66550049 has 4 divisors (see below), whose sum is σ = 66573360. Its totient is φ = 66526740.

The previous prime is 66550037. The next prime is 66550069. The reversal of 66550049 is 94005566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94005566 = 2 ⋅47002783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66550049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66550009) 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, 6659 + ... + 13320.

It is an arithmetic number, because the mean of its divisors is an integer number (16643340).

Almost surely, 2^66550049 is an apocalyptic number.

It is an amenable number.

66550049 is a deficient number, since it is larger than the sum of its proper divisors (23311).

66550049 is a wasteful number, since it uses less digits than its factorization.

66550049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23310.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 66550049 is about 8157.8213390586. The cubic root of 66550049 is about 405.2435643091.

The spelling of 66550049 in words is "sixty-six million, five hundred fifty thousand, forty-nine".