66320073 has 16 divisors (see below), whose sum is σ = 98526400. Its totient is φ = 44089920.

The previous prime is 66320057. The next prime is 66320101. The reversal of 66320073 is 37002366.

It is not a de Polignac number, because 66320073 - 2⁴ = 66320057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66320053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6993 + ... + 13473.

It is an arithmetic number, because the mean of its divisors is an integer number (6157900).

Almost surely, 2^66320073 is an apocalyptic number.

It is an amenable number.

66320073 is a deficient number, since it is larger than the sum of its proper divisors (32206327).

66320073 is a wasteful number, since it uses less digits than its factorization.

66320073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6869 (or 6863 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 27.

The square root of 66320073 is about 8143.7137105868. The cubic root of 66320073 is about 404.7762275490.

It can be divided in two parts, 663 and 20073, that added together give a 4-th power (20736 = 12⁴).

The spelling of 66320073 in words is "sixty-six million, three hundred twenty thousand, seventy-three".