66380645 has 16 divisors (see below), whose sum is σ = 84696192. Its totient is φ = 49832640.

The previous prime is 66380617. The next prime is 66380651. The reversal of 66380645 is 54608366.

It is not a de Polignac number, because 66380645 - 2¹⁴ = 66364261 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66380599 and 66380608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 650 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (5293512).

Almost surely, 2^66380645 is an apocalyptic number.

It is an amenable number.

66380645 is a deficient number, since it is larger than the sum of its proper divisors (18315547).

66380645 is a wasteful number, since it uses less digits than its factorization.

66380645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10972.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 66380645 is about 8147.4318039490. The cubic root of 66380645 is about 404.8994212467.

The spelling of 66380645 in words is "sixty-six million, three hundred eighty thousand, six hundred forty-five".