66406140235 has 4 divisors (see below), whose sum is σ = 79687368288. Its totient is φ = 53124912184.

The previous prime is 66406140221. The next prime is 66406140331. The reversal of 66406140235 is 53204160466.

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 66406140235 - 2⁷ = 66406140107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66406140194 and 66406140203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6640614019 + ... + 6640614028.

It is an arithmetic number, because the mean of its divisors is an integer number (19921842072).

Almost surely, 2^66406140235 is an apocalyptic number.

66406140235 is a deficient number, since it is larger than the sum of its proper divisors (13281228053).

66406140235 is a wasteful number, since it uses less digits than its factorization.

66406140235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13281228052.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 66406140235 in words is "sixty-six billion, four hundred six million, one hundred forty thousand, two hundred thirty-five".