66961469 has 4 divisors (see below), whose sum is σ = 68059260. Its totient is φ = 65863680.

The previous prime is 66961463. The next prime is 66961471. The reversal of 66961469 is 96416966.

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 31416025 + 35545444 = 5605^2 + 5962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66961469 is a prime.

It is a super-2 number, since 2×66961469² = 8967676661275922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66961463) 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, 548804 + ... + 548925.

It is an arithmetic number, because the mean of its divisors is an integer number (17014815).

Almost surely, 2^66961469 is an apocalyptic number.

It is an amenable number.

66961469 is a deficient number, since it is larger than the sum of its proper divisors (1097791).

66961469 is a wasteful number, since it uses less digits than its factorization.

66961469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097790.

The product of its digits is 419904, while the sum is 47.

The square root of 66961469 is about 8182.9987779542. The cubic root of 66961469 is about 406.0769366520.

The spelling of 66961469 in words is "sixty-six million, nine hundred sixty-one thousand, four hundred sixty-nine".