671221601155 has 16 divisors (see below), whose sum is σ = 924552285120. Its totient is φ = 458256339072.

The previous prime is 671221601153. The next prime is 671221601173. The reversal of 671221601155 is 551106122176.

It is not a de Polignac number, because 671221601155 - 2¹ = 671221601153 is a prime.

It is a super-3 number, since 3×671221601155³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (671221601153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41864824 + ... + 41880853.

It is an arithmetic number, because the mean of its divisors is an integer number (57784517820).

Almost surely, 2^671221601155 is an apocalyptic number.

671221601155 is a deficient number, since it is larger than the sum of its proper divisors (253330683965).

671221601155 is a wasteful number, since it uses less digits than its factorization.

671221601155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83745918.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 671221601155 in words is "six hundred seventy-one billion, two hundred twenty-one million, six hundred one thousand, one hundred fifty-five".