66344765 has 16 divisors (see below), whose sum is σ = 85107456. Its totient is φ = 49526400.

The previous prime is 66344731. The next prime is 66344771. The reversal of 66344765 is 56744366.

It is not a de Polignac number, because 66344765 - 2⁶ = 66344701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2321 + ... + 11750.

It is an arithmetic number, because the mean of its divisors is an integer number (5319216).

Almost surely, 2^66344765 is an apocalyptic number.

It is an amenable number.

66344765 is a deficient number, since it is larger than the sum of its proper divisors (18762691).

66344765 is a wasteful number, since it uses less digits than its factorization.

66344765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14140.

The product of its digits is 362880, while the sum is 41.

The square root of 66344765 is about 8145.2295854690. The cubic root of 66344765 is about 404.8264561551.

The spelling of 66344765 in words is "sixty-six million, three hundred forty-four thousand, seven hundred sixty-five".