66880743 has 4 divisors (see below), whose sum is σ = 89174328. Its totient is φ = 44587160.

The previous prime is 66880739. The next prime is 66880811. The reversal of 66880743 is 34708866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66880743 - 2² = 66880739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66880695 and 66880704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66880843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11146788 + ... + 11146793.

It is an arithmetic number, because the mean of its divisors is an integer number (22293582).

Almost surely, 2^66880743 is an apocalyptic number.

66880743 is a deficient number, since it is larger than the sum of its proper divisors (22293585).

66880743 is a wasteful number, since it uses less digits than its factorization.

66880743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22293584.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 66880743 is about 8178.0647466256. The cubic root of 66880743 is about 405.9136878004.

The spelling of 66880743 in words is "sixty-six million, eight hundred eighty thousand, seven hundred forty-three".