66660070 has 16 divisors (see below), whose sum is σ = 120085920. Its totient is φ = 26642304.

The previous prime is 66660059. The next prime is 66660071. The reversal of 66660070 is 7006666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660071) 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, 16951 + ... + 20509.

It is an arithmetic number, because the mean of its divisors is an integer number (7505370).

Almost surely, 2^66660070 is an apocalyptic number.

66660070 is a deficient number, since it is larger than the sum of its proper divisors (53425850).

66660070 is a wasteful number, since it uses less digits than its factorization.

66660070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 66660070 is about 8164.5618376003. The cubic root of 66660070 is about 405.4667585107.

The spelling of 66660070 in words is "sixty-six million, six hundred sixty thousand, seventy".