66531552 has 24 divisors (see below), whose sum is σ = 174645576. Its totient is φ = 22177152.

The previous prime is 66531499. The next prime is 66531583. The reversal of 66531552 is 25513566.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346423 + ... + 346614.

It is an arithmetic number, because the mean of its divisors is an integer number (7276899).

Almost surely, 2^66531552 is an apocalyptic number.

It is an amenable number.

66531552 is an abundant number, since it is smaller than the sum of its proper divisors (108114024).

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

66531552 is a wasteful number, since it uses less digits than its factorization.

66531552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693050 (or 693042 counting only the distinct ones).

The product of its digits is 27000, while the sum is 33.

The square root of 66531552 is about 8156.6875629755. The cubic root of 66531552 is about 405.2060162036.

The spelling of 66531552 in words is "sixty-six million, five hundred thirty-one thousand, five hundred fifty-two".