66020451 has 16 divisors (see below), whose sum is σ = 100789248. Its totient is φ = 37656000.

The previous prime is 66020447. The next prime is 66020489. The reversal of 66020451 is 15402066.

It is not a de Polignac number, because 66020451 - 2² = 66020447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66020411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10006 + ... + 15236.

It is an arithmetic number, because the mean of its divisors is an integer number (6299328).

Almost surely, 2^66020451 is an apocalyptic number.

66020451 is a deficient number, since it is larger than the sum of its proper divisors (34768797).

66020451 is a wasteful number, since it uses less digits than its factorization.

66020451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5842.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 66020451 is about 8125.2969791879. The cubic root of 66020451 is about 404.1657388626.

The spelling of 66020451 in words is "sixty-six million, twenty thousand, four hundred fifty-one".