215640634641 has 8 divisors (see below), whose sum is σ = 300021752640. Its totient is φ = 137509969872.

The previous prime is 215640634609. The next prime is 215640634669. The reversal of 215640634641 is 146436046512.

215640634641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215640634641 - 2⁵ = 215640634609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215640634593 and 215640634602.

It is not an unprimeable number, because it can be changed into a prime (215640634441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1562613226 + ... + 1562613363.

It is an arithmetic number, because the mean of its divisors is an integer number (37502719080).

Almost surely, 2^215640634641 is an apocalyptic number.

It is an amenable number.

215640634641 is a deficient number, since it is larger than the sum of its proper divisors (84381117999).

215640634641 is a wasteful number, since it uses less digits than its factorization.

215640634641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125226615.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 215640634641 in words is "two hundred fifteen billion, six hundred forty million, six hundred thirty-four thousand, six hundred forty-one".