2321640332655 has 64 divisors (see below), whose sum is σ = 4396366679040. Its totient is φ = 1023629128704.

The previous prime is 2321640332651. The next prime is 2321640332677. The reversal of 2321640332655 is 5562330461232.

It is not a de Polignac number, because 2321640332655 - 2² = 2321640332651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2321640332651) 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, 2446312 + ... + 3260018.

It is an arithmetic number, because the mean of its divisors is an integer number (68693229360).

Almost surely, 2^{2321640332655} is an apocalyptic number.

2321640332655 is a deficient number, since it is larger than the sum of its proper divisors (2074726346385).

2321640332655 is a wasteful number, since it uses less digits than its factorization.

2321640332655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814688.

The product of its (nonzero) digits is 777600, while the sum is 42.

Adding to 2321640332655 its reverse (5562330461232), we get a palindrome (7883970793887).

The spelling of 2321640332655 in words is "two trillion, three hundred twenty-one billion, six hundred forty million, three hundred thirty-two thousand, six hundred fifty-five".