66402042402642 has 64 divisors (see below), whose sum is σ = 142394326078464. Its totient is φ = 20589211938240.

The previous prime is 66402042402611. The next prime is 66402042402643. The reversal of 66402042402642 is 24620424020466.

It is a happy number.

66402042402642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66402042402594 and 66402042402603.

It is not an unprimeable number, because it can be changed into a prime (66402042402643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7034773 + ... + 13501559.

It is an arithmetic number, because the mean of its divisors is an integer number (2224911344976).

Almost surely, 2^{66402042402642} is an apocalyptic number.

66402042402642 is an abundant number, since it is smaller than the sum of its proper divisors (75992283675822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66402042402642 is a wasteful number, since it uses less digits than its factorization.

66402042402642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6468863.

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 66402042402642 in words is "sixty-six trillion, four hundred two billion, forty-two million, four hundred two thousand, six hundred forty-two".