66281051 has 4 divisors (see below), whose sum is σ = 67897704. Its totient is φ = 64664400.

The previous prime is 66281041. The next prime is 66281057. The reversal of 66281051 is 15018266.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66281051 - 2¹⁸ = 66018907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66281057) 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, 808265 + ... + 808346.

It is an arithmetic number, because the mean of its divisors is an integer number (16974426).

Almost surely, 2^66281051 is an apocalyptic number.

66281051 is a deficient number, since it is larger than the sum of its proper divisors (1616653).

66281051 is a wasteful number, since it uses less digits than its factorization.

66281051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616652.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 66281051 is about 8141.3175223670. The cubic root of 66281051 is about 404.6968233497.

The spelling of 66281051 in words is "sixty-six million, two hundred eighty-one thousand, fifty-one".