66709761 has 8 divisors (see below), whose sum is σ = 89335680. Its totient is φ = 44278512.

The previous prime is 66709759. The next prime is 66709787. The reversal of 66709761 is 16790766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66709761 - 2¹ = 66709759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66709061) 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, 47865 + ... + 49238.

It is an arithmetic number, because the mean of its divisors is an integer number (11166960).

Almost surely, 2^66709761 is an apocalyptic number.

It is an amenable number.

66709761 is a deficient number, since it is larger than the sum of its proper divisors (22625919).

66709761 is a wasteful number, since it uses less digits than its factorization.

66709761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97335.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 66709761 is about 8167.6043611331. The cubic root of 66709761 is about 405.5674836994.

The spelling of 66709761 in words is "sixty-six million, seven hundred nine thousand, seven hundred sixty-one".