215581662371 has 2 divisors, whose sum is σ = 215581662372. Its totient is φ = 215581662370.

The previous prime is 215581662353. The next prime is 215581662427. The reversal of 215581662371 is 173266185512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215581662371 is a prime.

It is not a weakly prime, because it can be changed into another prime (215581662071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107790831185 + 107790831186.

It is an arithmetic number, because the mean of its divisors is an integer number (107790831186).

Almost surely, 2^215581662371 is an apocalyptic number.

215581662371 is a deficient number, since it is larger than the sum of its proper divisors (1).

215581662371 is an equidigital number, since it uses as much as digits as its factorization.

215581662371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 47.

The spelling of 215581662371 in words is "two hundred fifteen billion, five hundred eighty-one million, six hundred sixty-two thousand, three hundred seventy-one".