66142651 has 4 divisors (see below), whose sum is σ = 66824632. Its totient is φ = 65460672.

The previous prime is 66142621. The next prime is 66142697. The reversal of 66142651 is 15624166.

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 66142651 - 2⁵ = 66142619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66142621) 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, 340845 + ... + 341038.

It is an arithmetic number, because the mean of its divisors is an integer number (16706158).

Almost surely, 2^66142651 is an apocalyptic number.

66142651 is a deficient number, since it is larger than the sum of its proper divisors (681981).

66142651 is an equidigital number, since it uses as much as digits as its factorization.

66142651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681980.

The product of its digits is 8640, while the sum is 31.

The square root of 66142651 is about 8132.8132279058. The cubic root of 66142651 is about 404.4149475636.

The spelling of 66142651 in words is "sixty-six million, one hundred forty-two thousand, six hundred fifty-one".