215915064487 has 2 divisors, whose sum is σ = 215915064488. Its totient is φ = 215915064486.

The previous prime is 215915064451. The next prime is 215915064503. The reversal of 215915064487 is 784460519512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215915064487 - 2¹¹ = 215915062439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215915064587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107957532243 + 107957532244.

It is an arithmetic number, because the mean of its divisors is an integer number (107957532244).

Almost surely, 2^215915064487 is an apocalyptic number.

215915064487 is a deficient number, since it is larger than the sum of its proper divisors (1).

215915064487 is an equidigital number, since it uses as much as digits as its factorization.

215915064487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 215915064487 in words is "two hundred fifteen billion, nine hundred fifteen million, sixty-four thousand, four hundred eighty-seven".