66531284 has 12 divisors (see below), whose sum is σ = 116512704. Its totient is φ = 33241944.

The previous prime is 66531281. The next prime is 66531287. The reversal of 66531284 is 48213566.

It is an interprime number because it is at equal distance from previous prime (66531281) and next prime (66531287).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66531281) 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, 1397 + ... + 11619.

It is an arithmetic number, because the mean of its divisors is an integer number (9709392).

Almost surely, 2^66531284 is an apocalyptic number.

It is an amenable number.

66531284 is a deficient number, since it is larger than the sum of its proper divisors (49981420).

66531284 is a wasteful number, since it uses less digits than its factorization.

66531284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11854 (or 11852 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 66531284 is about 8156.6711347216. The cubic root of 66531284 is about 405.2054721241.

The spelling of 66531284 in words is "sixty-six million, five hundred thirty-one thousand, two hundred eighty-four".