66402311745 has 64 divisors (see below), whose sum is σ = 132545710080. Its totient is φ = 27577843200.

The previous prime is 66402311741. The next prime is 66402311779. The reversal of 66402311745 is 54711320466.

It is a happy number.

It is not a de Polignac number, because 66402311745 - 2² = 66402311741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66402311741) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1840530 + ... + 1876260.

It is an arithmetic number, because the mean of its divisors is an integer number (2071026720).

Almost surely, 2^66402311745 is an apocalyptic number.

It is an amenable number.

66402311745 is a deficient number, since it is larger than the sum of its proper divisors (66143398335).

66402311745 is a wasteful number, since it uses less digits than its factorization.

66402311745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37366.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 66402311745 in words is "sixty-six billion, four hundred two million, three hundred eleven thousand, seven hundred forty-five".