215616700645 has 8 divisors (see below), whose sum is σ = 259850514456. Its totient is φ = 171753044736.

The previous prime is 215616700643. The next prime is 215616700693. The reversal of 215616700645 is 546007616512.

It can be written as a sum of positive squares in 4 ways, for example, as 43120183716 + 172496516929 = 207654^2 + 415327^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215616700645 - 2¹ = 215616700643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215616700643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 92538192 + ... + 92540521.

It is an arithmetic number, because the mean of its divisors is an integer number (32481314307).

Almost surely, 2^215616700645 is an apocalyptic number.

It is an amenable number.

215616700645 is a deficient number, since it is larger than the sum of its proper divisors (44233813811).

215616700645 is a wasteful number, since it uses less digits than its factorization.

215616700645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185078951.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 215616700645 in words is "two hundred fifteen billion, six hundred sixteen million, seven hundred thousand, six hundred forty-five".