66773513 has 4 divisors (see below), whose sum is σ = 67198980. Its totient is φ = 66348048.

The previous prime is 66773507. The next prime is 66773519. The reversal of 66773513 is 31537766.

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

It is an interprime number because it is at equal distance from previous prime (66773507) and next prime (66773519).

It can be written as a sum of positive squares in 2 ways, for example, as 46676224 + 20097289 = 6832^2 + 4483^2 .

It is a cyclic number.

It is not a de Polignac number, because 66773513 - 2⁶ = 66773449 is a prime.

It is a super-2 number, since 2×66773513² = 8917404076722338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66773519) 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, 212498 + ... + 212811.

It is an arithmetic number, because the mean of its divisors is an integer number (16799745).

Almost surely, 2^66773513 is an apocalyptic number.

It is an amenable number.

66773513 is a deficient number, since it is larger than the sum of its proper divisors (425467).

66773513 is a wasteful number, since it uses less digits than its factorization.

66773513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425466.

The product of its digits is 79380, while the sum is 38.

The square root of 66773513 is about 8171.5061647165. The cubic root of 66773513 is about 405.6966377430.

The spelling of 66773513 in words is "sixty-six million, seven hundred seventy-three thousand, five hundred thirteen".