66733551 has 20 divisors (see below), whose sum is σ = 105554592. Its totient is φ = 41871168.

The previous prime is 66733531. The next prime is 66733631. The reversal of 66733551 is 15533766.

It is a happy number.

It is not a de Polignac number, because 66733551 - 2⁶ = 66733487 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22855 + ... + 25608.

Almost surely, 2^66733551 is an apocalyptic number.

66733551 is a deficient number, since it is larger than the sum of its proper divisors (38821041).

66733551 is a wasteful number, since it uses less digits than its factorization.

66733551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48492 (or 48483 counting only the distinct ones).

The product of its digits is 56700, while the sum is 36.

The square root of 66733551 is about 8169.0605947073. The cubic root of 66733551 is about 405.6156890573.

The spelling of 66733551 in words is "sixty-six million, seven hundred thirty-three thousand, five hundred fifty-one".