215515556667 has 24 divisors (see below), whose sum is σ = 314413332480. Its totient is φ = 142241972400.

The previous prime is 215515556591. The next prime is 215515556671. The reversal of 215515556667 is 766655515512.

It is not a de Polignac number, because 215515556667 - 2¹⁰ = 215515555643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215515556677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1429542 + ... + 1573092.

It is an arithmetic number, because the mean of its divisors is an integer number (13100555520).

Almost surely, 2^215515556667 is an apocalyptic number.

215515556667 is a deficient number, since it is larger than the sum of its proper divisors (98897775813).

215515556667 is a wasteful number, since it uses less digits than its factorization.

215515556667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145223 (or 145220 counting only the distinct ones).

The product of its digits is 9450000, while the sum is 54.

The spelling of 215515556667 in words is "two hundred fifteen billion, five hundred fifteen million, five hundred fifty-six thousand, six hundred sixty-seven".