66535051 has 4 divisors (see below), whose sum is σ = 72583704. Its totient is φ = 60486400.

The previous prime is 66535037. The next prime is 66535081. The reversal of 66535051 is 15053566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66535051 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66535081) 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, 3024310 + ... + 3024331.

It is an arithmetic number, because the mean of its divisors is an integer number (18145926).

Almost surely, 2^66535051 is an apocalyptic number.

66535051 is a deficient number, since it is larger than the sum of its proper divisors (6048653).

66535051 is a wasteful number, since it uses less digits than its factorization.

66535051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048652.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 66535051 is about 8156.9020467332. The cubic root of 66535051 is about 405.2131195551.

The spelling of 66535051 in words is "sixty-six million, five hundred thirty-five thousand, fifty-one".