66700787 has 4 divisors (see below), whose sum is σ = 66717240. Its totient is φ = 66684336.

The previous prime is 66700771. The next prime is 66700793. The reversal of 66700787 is 78700766.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66700787 - 2⁴ = 66700771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66700717) 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, 2639 + ... + 11847.

It is an arithmetic number, because the mean of its divisors is an integer number (16679310).

Almost surely, 2^66700787 is an apocalyptic number.

66700787 is a deficient number, since it is larger than the sum of its proper divisors (16453).

66700787 is an equidigital number, since it uses as much as digits as its factorization.

66700787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16452.

The product of its (nonzero) digits is 98784, while the sum is 41.

The square root of 66700787 is about 8167.0549771628. The cubic root of 66700787 is about 405.5492968266.

The spelling of 66700787 in words is "sixty-six million, seven hundred thousand, seven hundred eighty-seven".