66106451 has 4 divisors (see below), whose sum is σ = 66200400. Its totient is φ = 66012504.

The previous prime is 66106433. The next prime is 66106483. The reversal of 66106451 is 15460166.

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 66106451 - 2¹⁸ = 65844307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66106151) 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, 45911 + ... + 47328.

It is an arithmetic number, because the mean of its divisors is an integer number (16550100).

Almost surely, 2^66106451 is an apocalyptic number.

66106451 is a deficient number, since it is larger than the sum of its proper divisors (93949).

66106451 is an equidigital number, since it uses as much as digits as its factorization.

66106451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93948.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66106451 is about 8130.5873711559. The cubic root of 66106451 is about 404.3411550737.

The spelling of 66106451 in words is "sixty-six million, one hundred six thousand, four hundred fifty-one".