66718047 has 16 divisors (see below), whose sum is σ = 102753792. Its totient is φ = 38056320.

The previous prime is 66718033. The next prime is 66718073. The reversal of 66718047 is 74081766.

It is not a de Polignac number, because 66718047 - 2¹⁸ = 66455903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66717996 and 66718014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66718097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58903 + ... + 60024.

It is an arithmetic number, because the mean of its divisors is an integer number (6422112).

Almost surely, 2^66718047 is an apocalyptic number.

66718047 is a deficient number, since it is larger than the sum of its proper divisors (36035745).

66718047 is a wasteful number, since it uses less digits than its factorization.

66718047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118958.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 66718047 is about 8168.1115932632. Note that the first 3 decimals coincide. The cubic root of 66718047 is about 405.5842748106.

The spelling of 66718047 in words is "sixty-six million, seven hundred eighteen thousand, forty-seven".