66140051 has 4 divisors (see below), whose sum is σ = 66235104. Its totient is φ = 66045000.

The previous prime is 66140033. The next prime is 66140069. The reversal of 66140051 is 15004166.

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

It is an interprime number because it is at equal distance from previous prime (66140033) and next prime (66140069).

It is a cyclic number.

It is not a de Polignac number, because 66140051 - 2²² = 61945747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66139999 and 66140026.

It is not an unprimeable number, because it can be changed into a prime (66140071) 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, 46475 + ... + 47876.

It is an arithmetic number, because the mean of its divisors is an integer number (16558776).

Almost surely, 2^66140051 is an apocalyptic number.

66140051 is a deficient number, since it is larger than the sum of its proper divisors (95053).

66140051 is an equidigital number, since it uses as much as digits as its factorization.

66140051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95052.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 66140051 is about 8132.6533800476. The cubic root of 66140051 is about 404.4096484481.

The spelling of 66140051 in words is "sixty-six million, one hundred forty thousand, fifty-one".