66611964 has 12 divisors (see below), whose sum is σ = 155427944. Its totient is φ = 22203984.

The previous prime is 66611959. The next prime is 66611969. The reversal of 66611964 is 46911666.

It is an interprime number because it is at equal distance from previous prime (66611959) and next prime (66611969).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66611969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2775487 + ... + 2775510.

Almost surely, 2^66611964 is an apocalyptic number.

It is an amenable number.

66611964 is an abundant number, since it is smaller than the sum of its proper divisors (88815980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66611964 is a wasteful number, since it uses less digits than its factorization.

66611964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551004 (or 5551002 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 66611964 is about 8161.6152813031. The cubic root of 66611964 is about 405.3691984678.

The spelling of 66611964 in words is "sixty-six million, six hundred eleven thousand, nine hundred sixty-four".