66680995 has 4 divisors (see below), whose sum is σ = 80017200. Its totient is φ = 53344792.

The previous prime is 66680989. The next prime is 66681007. The reversal of 66680995 is 59908666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59908666 = 2 ⋅29954333.

It is a cyclic number.

It is not a de Polignac number, because 66680995 - 2¹³ = 66672803 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6668095 + ... + 6668104.

It is an arithmetic number, because the mean of its divisors is an integer number (20004300).

Almost surely, 2^66680995 is an apocalyptic number.

66680995 is a deficient number, since it is larger than the sum of its proper divisors (13336205).

66680995 is a wasteful number, since it uses less digits than its factorization.

66680995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336204.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 66680995 is about 8165.8431897753. The cubic root of 66680995 is about 405.5091802299.

The spelling of 66680995 in words is "sixty-six million, six hundred eighty thousand, nine hundred ninety-five".