66961564 has 12 divisors (see below), whose sum is σ = 120350104. Its totient is φ = 32575824.

The previous prime is 66961561. The next prime is 66961577. The reversal of 66961564 is 46516966.

It is a self number, because there is not a number n which added to its sum of digits gives 66961564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66961561) 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, 226074 + ... + 226369.

Almost surely, 2^66961564 is an apocalyptic number.

It is an amenable number.

66961564 is a deficient number, since it is larger than the sum of its proper divisors (53388540).

66961564 is a wasteful number, since it uses less digits than its factorization.

66961564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452484 (or 452482 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 66961564 is about 8183.0045826701. The cubic root of 66961564 is about 406.0771286892.

The spelling of 66961564 in words is "sixty-six million, nine hundred sixty-one thousand, five hundred sixty-four".