66770617 has 4 divisors (see below), whose sum is σ = 70284880. Its totient is φ = 63256356.

The previous prime is 66770609. The next prime is 66770647. The reversal of 66770617 is 71607766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71607766 = 2 ⋅35803883.

It is a cyclic number.

It is not a de Polignac number, because 66770617 - 2³ = 66770609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66770617.

It is not an unprimeable number, because it can be changed into a prime (66770647) 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, 1757103 + ... + 1757140.

It is an arithmetic number, because the mean of its divisors is an integer number (17571220).

Almost surely, 2^66770617 is an apocalyptic number.

It is an amenable number.

66770617 is a deficient number, since it is larger than the sum of its proper divisors (3514263).

66770617 is a wasteful number, since it uses less digits than its factorization.

66770617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514262.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 66770617 is about 8171.3289616806. The cubic root of 66770617 is about 405.6907725708.

The spelling of 66770617 in words is "sixty-six million, seven hundred seventy thousand, six hundred seventeen".