155116635050221 has 32 divisors (see below), whose sum is σ = 171939068945280. Its totient is φ = 139054425235200.

The previous prime is 155116635050197. The next prime is 155116635050291. The reversal of 155116635050221 is 122050536611551.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 155116635050221 - 2¹⁷ = 155116634919149 is a prime.

It is a super-2 number, since 2×155116635050221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155116635050291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105833131 + ... + 107288791.

It is an arithmetic number, because the mean of its divisors is an integer number (5373095904540).

Almost surely, 2^{155116635050221} is an apocalyptic number.

It is an amenable number.

155116635050221 is a deficient number, since it is larger than the sum of its proper divisors (16822433895059).

155116635050221 is a wasteful number, since it uses less digits than its factorization.

155116635050221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457437.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 155116635050221 in words is "one hundred fifty-five trillion, one hundred sixteen billion, six hundred thirty-five million, fifty thousand, two hundred twenty-one".