66969261 has 40 divisors (see below), whose sum is σ = 105705600. Its totient is φ = 42169248.

The previous prime is 66969241. The next prime is 66969283. The reversal of 66969261 is 16296966.

It is not a de Polignac number, because 66969261 - 2⁶ = 66969197 is a prime.

It is a super-2 number, since 2×66969261² = 8969763837772242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66969241) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 191715 + ... + 192063.

It is an arithmetic number, because the mean of its divisors is an integer number (2642640).

Almost surely, 2^66969261 is an apocalyptic number.

It is an amenable number.

66969261 is a deficient number, since it is larger than the sum of its proper divisors (38736339).

66969261 is a wasteful number, since it uses less digits than its factorization.

66969261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 478 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 66969261 is about 8183.4748731819. The cubic root of 66969261 is about 406.0926871466.

The spelling of 66969261 in words is "sixty-six million, nine hundred sixty-nine thousand, two hundred sixty-one".