66015333649 has 16 divisors (see below), whose sum is σ = 70367512320. Its totient is φ = 61845447040.

The previous prime is 66015333583. The next prime is 66015333689. The reversal of 66015333649 is 94633351066.

66015333649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66015333649 - 2²⁷ = 65881115921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66015333599 and 66015333608.

It is not an unprimeable number, because it can be changed into a prime (66015333689) 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, 221059 + ... + 425320.

It is an arithmetic number, because the mean of its divisors is an integer number (4397969520).

Almost surely, 2^66015333649 is an apocalyptic number.

It is an amenable number.

66015333649 is a deficient number, since it is larger than the sum of its proper divisors (4352178671).

66015333649 is a wasteful number, since it uses less digits than its factorization.

66015333649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646520.

The product of its (nonzero) digits is 1049760, while the sum is 46.

The spelling of 66015333649 in words is "sixty-six billion, fifteen million, three hundred thirty-three thousand, six hundred forty-nine".