66402617 has 4 divisors (see below), whose sum is σ = 66570276. Its totient is φ = 66234960.

The previous prime is 66402607. The next prime is 66402643. The reversal of 66402617 is 71620466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47183161 + 19219456 = 6869^2 + 4384^2 .

It is a cyclic number.

It is not a de Polignac number, because 66402617 - 2¹⁰ = 66401593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66402607) 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, 83234 + ... + 84027.

It is an arithmetic number, because the mean of its divisors is an integer number (16642569).

Almost surely, 2^66402617 is an apocalyptic number.

It is an amenable number.

66402617 is a deficient number, since it is larger than the sum of its proper divisors (167659).

66402617 is a wasteful number, since it uses less digits than its factorization.

66402617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167658.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 66402617 is about 8148.7800927501. The cubic root of 66402617 is about 404.9440902346.

The spelling of 66402617 in words is "sixty-six million, four hundred two thousand, six hundred seventeen".