66613632 has 32 divisors (see below), whose sum is σ = 176943480. Its totient is φ = 22204416.

The previous prime is 66613627. The next prime is 66613649. The reversal of 66613632 is 23631666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66613593 and 66613602.

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, 86353 + ... + 87120.

Almost surely, 2^66613632 is an apocalyptic number.

It is an amenable number.

66613632 is an abundant number, since it is smaller than the sum of its proper divisors (110329848).

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

66613632 is a wasteful number, since it uses less digits than its factorization.

66613632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173490 (or 173478 counting only the distinct ones).

The product of its digits is 23328, while the sum is 33.

The square root of 66613632 is about 8161.7174663180. The cubic root of 66613632 is about 405.3725819950.

The spelling of 66613632 in words is "sixty-six million, six hundred thirteen thousand, six hundred thirty-two".