66765751 has 8 divisors (see below), whose sum is σ = 72028544. Its totient is φ = 61521120.

The previous prime is 66765739. The next prime is 66765763. The reversal of 66765751 is 15756766.

It is an interprime number because it is at equal distance from previous prime (66765739) and next prime (66765763).

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 66765751 - 2⁷ = 66765623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66765698 and 66765707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6765751) 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, 3661 + ... + 12121.

It is an arithmetic number, because the mean of its divisors is an integer number (9003568).

Almost surely, 2^66765751 is an apocalyptic number.

66765751 is a deficient number, since it is larger than the sum of its proper divisors (5262793).

66765751 is a wasteful number, since it uses less digits than its factorization.

66765751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9081.

The product of its digits is 264600, while the sum is 43.

The square root of 66765751 is about 8171.0312078709. The cubic root of 66765751 is about 405.6809172415.

The spelling of 66765751 in words is "sixty-six million, seven hundred sixty-five thousand, seven hundred fifty-one".