66740751 has 48 divisors (see below), whose sum is σ = 121056000. Its totient is φ = 34421760.

The previous prime is 66740747. The next prime is 66740767. The reversal of 66740751 is 15704766.

It is not a de Polignac number, because 66740751 - 2² = 66740747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66748751) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133500 + ... + 133998.

It is an arithmetic number, because the mean of its divisors is an integer number (2522000).

Almost surely, 2^66740751 is an apocalyptic number.

66740751 is a deficient number, since it is larger than the sum of its proper divisors (54315249).

66740751 is a wasteful number, since it uses less digits than its factorization.

66740751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 66740751 is about 8169.5012699675. The cubic root of 66740751 is about 405.6302760624.

The spelling of 66740751 in words is "sixty-six million, seven hundred forty thousand, seven hundred fifty-one".