215545131887 has 2 divisors, whose sum is σ = 215545131888. Its totient is φ = 215545131886.

The previous prime is 215545131883. The next prime is 215545131911. The reversal of 215545131887 is 788131545512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215545131887 - 2² = 215545131883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215545131881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107772565943 + 107772565944.

It is an arithmetic number, because the mean of its divisors is an integer number (107772565944).

Almost surely, 2^215545131887 is an apocalyptic number.

215545131887 is a deficient number, since it is larger than the sum of its proper divisors (1).

215545131887 is an equidigital number, since it uses as much as digits as its factorization.

215545131887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344000, while the sum is 50.

The spelling of 215545131887 in words is "two hundred fifteen billion, five hundred forty-five million, one hundred thirty-one thousand, eight hundred eighty-seven".