215605223655 has 32 divisors (see below), whose sum is σ = 365320476864. Its totient is φ = 108207630336.

The previous prime is 215605223653. The next prime is 215605223681. The reversal of 215605223655 is 556322506512.

It is not a de Polignac number, because 215605223655 - 2¹ = 215605223653 is a prime.

It is a super-2 number, since 2×215605223655² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215605223653) 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 31 ways as a sum of consecutive naturals, for example, 1565149 + ... + 1697321.

It is an arithmetic number, because the mean of its divisors is an integer number (11416264902).

Almost surely, 2^215605223655 is an apocalyptic number.

215605223655 is a deficient number, since it is larger than the sum of its proper divisors (149715253209).

215605223655 is a wasteful number, since it uses less digits than its factorization.

215605223655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138595.

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 215605223655 in words is "two hundred fifteen billion, six hundred five million, two hundred twenty-three thousand, six hundred fifty-five".