215012445517 has 2 divisors, whose sum is σ = 215012445518. Its totient is φ = 215012445516.

The previous prime is 215012445497. The next prime is 215012445551. The reversal of 215012445517 is 715544210512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116026071876 + 98986373641 = 340626^2 + 314621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215012445517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215012445587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107506222758 + 107506222759.

It is an arithmetic number, because the mean of its divisors is an integer number (107506222759).

Almost surely, 2^215012445517 is an apocalyptic number.

It is an amenable number.

215012445517 is a deficient number, since it is larger than the sum of its proper divisors (1).

215012445517 is an equidigital number, since it uses as much as digits as its factorization.

215012445517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56000, while the sum is 37.

The spelling of 215012445517 in words is "two hundred fifteen billion, twelve million, four hundred forty-five thousand, five hundred seventeen".