65330021647 has 32 divisors (see below), whose sum is σ = 73498613760. Its totient is φ = 57556638720.

The previous prime is 65330021609. The next prime is 65330021663. The reversal of 65330021647 is 74612003356.

It is a cyclic number.

It is not a de Polignac number, because 65330021647 - 2¹⁵ = 65329988879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65330021447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37139554 + ... + 37141312.

It is an arithmetic number, because the mean of its divisors is an integer number (2296831680).

Almost surely, 2^65330021647 is an apocalyptic number.

65330021647 is a deficient number, since it is larger than the sum of its proper divisors (8168592113).

65330021647 is a wasteful number, since it uses less digits than its factorization.

65330021647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383.

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 65330021647 in words is "sixty-five billion, three hundred thirty million, twenty-one thousand, six hundred forty-seven".