66401876235245 has 16 divisors (see below), whose sum is σ = 79891255800000. Its totient is φ = 52982296301568.

The previous prime is 66401876235241. The next prime is 66401876235269. The reversal of 66401876235245 is 54253267810466.

It is a cyclic number.

It is not a de Polignac number, because 66401876235245 - 2² = 66401876235241 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66401876235241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4179860 + ... + 12258669.

It is an arithmetic number, because the mean of its divisors is an integer number (4993203487500).

Almost surely, 2^{66401876235245} is an apocalyptic number.

It is an amenable number.

66401876235245 is a deficient number, since it is larger than the sum of its proper divisors (13489379564755).

66401876235245 is a wasteful number, since it uses less digits than its factorization.

66401876235245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16440652.

The product of its (nonzero) digits is 58060800, while the sum is 59.

The spelling of 66401876235245 in words is "sixty-six trillion, four hundred one billion, eight hundred seventy-six million, two hundred thirty-five thousand, two hundred forty-five".