215617078545 has 64 divisors (see below), whose sum is σ = 389950848000. Its totient is φ = 100830429440.

The previous prime is 215617078519. The next prime is 215617078553. The reversal of 215617078545 is 545870716512.

It is not a de Polignac number, because 215617078545 - 2⁵ = 215617078513 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 307006 + ... + 724904.

It is an arithmetic number, because the mean of its divisors is an integer number (6092982000).

Almost surely, 2^215617078545 is an apocalyptic number.

It is an amenable number.

215617078545 is a deficient number, since it is larger than the sum of its proper divisors (174333769455).

215617078545 is a wasteful number, since it uses less digits than its factorization.

215617078545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418030.

The product of its (nonzero) digits is 2352000, while the sum is 51.

The spelling of 215617078545 in words is "two hundred fifteen billion, six hundred seventeen million, seventy-eight thousand, five hundred forty-five".