66201351844 has 24 divisors (see below), whose sum is σ = 126155030400. Its totient is φ = 30277205280.

The previous prime is 66201351833. The next prime is 66201351871. The reversal of 66201351844 is 44815310266.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66201351797 and 66201351806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15016252 + ... + 15020659.

It is an arithmetic number, because the mean of its divisors is an integer number (5256459600).

Almost surely, 2^66201351844 is an apocalyptic number.

It is an amenable number.

66201351844 is a deficient number, since it is larger than the sum of its proper divisors (59953678556).

66201351844 is a wasteful number, since it uses less digits than its factorization.

66201351844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30036963 (or 30036961 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 66201351844 in words is "sixty-six billion, two hundred one million, three hundred fifty-one thousand, eight hundred forty-four".