66545710451 has 32 divisors (see below), whose sum is σ = 75478597632. Its totient is φ = 58122900000.

The previous prime is 66545710397. The next prime is 66545710471. The reversal of 66545710451 is 15401754566.

It is a happy number.

It is not a de Polignac number, because 66545710451 - 2¹⁰ = 66545709427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66545710471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64544306 + ... + 64545336.

It is an arithmetic number, because the mean of its divisors is an integer number (2358706176).

Almost surely, 2^66545710451 is an apocalyptic number.

66545710451 is a deficient number, since it is larger than the sum of its proper divisors (8932887181).

66545710451 is a wasteful number, since it uses less digits than its factorization.

66545710451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 66545710451 in words is "sixty-six billion, five hundred forty-five million, seven hundred ten thousand, four hundred fifty-one".