66737573 has 8 divisors (see below), whose sum is σ = 76320960. Its totient is φ = 57166560.

The previous prime is 66737543. The next prime is 66737581. The reversal of 66737573 is 37573766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66737573 - 2⁸ = 66737317 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66737543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19193 + ... + 22401.

It is an arithmetic number, because the mean of its divisors is an integer number (9540120).

Almost surely, 2^66737573 is an apocalyptic number.

It is an amenable number.

66737573 is a deficient number, since it is larger than the sum of its proper divisors (9583387).

66737573 is a wasteful number, since it uses less digits than its factorization.

66737573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6187.

The product of its digits is 555660, while the sum is 44.

The square root of 66737573 is about 8169.3067637346. The cubic root of 66737573 is about 405.6238376498.

The spelling of 66737573 in words is "sixty-six million, seven hundred thirty-seven thousand, five hundred seventy-three".