215515424515541 has 2 divisors, whose sum is σ = 215515424515542. Its totient is φ = 215515424515540.

The previous prime is 215515424515451. The next prime is 215515424515549. The reversal of 215515424515541 is 145515424515512.

Together with previous prime (215515424515451) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212948206635025 + 2567217880516 = 14592745^2 + 1602254^2 .

It is a cyclic number.

It is not a de Polignac number, because 215515424515541 - 2²² = 215515420321237 is a prime.

It is a super-2 number, since 2×215515424515541² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215515424515541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215515424515549) 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 as a sum of consecutive naturals, namely, 107757712257770 + 107757712257771.

It is an arithmetic number, because the mean of its divisors is an integer number (107757712257771).

Almost surely, 2^{215515424515541} is an apocalyptic number.

It is an amenable number.

215515424515541 is a deficient number, since it is larger than the sum of its proper divisors (1).

215515424515541 is an equidigital number, since it uses as much as digits as its factorization.

215515424515541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000000, while the sum is 50.

The spelling of 215515424515541 in words is "two hundred fifteen trillion, five hundred fifteen billion, four hundred twenty-four million, five hundred fifteen thousand, five hundred forty-one".