251216313221671 has 16 divisors (see below), whose sum is σ = 290375406903808. Its totient is φ = 212888498508000.

The previous prime is 251216313221641. The next prime is 251216313221681. The reversal of 251216313221671 is 176122313612152.

251216313221671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 251216313221671 - 2⁷ = 251216313221543 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 (251216313221641) 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, 562974060 + ... + 563420113.

It is an arithmetic number, because the mean of its divisors is an integer number (18148462931488).

Almost surely, 2^{251216313221671} is an apocalyptic number.

251216313221671 is a deficient number, since it is larger than the sum of its proper divisors (39159093682137).

251216313221671 is a wasteful number, since it uses less digits than its factorization.

251216313221671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126394542.

The product of its digits is 181440, while the sum is 43.

The spelling of 251216313221671 in words is "two hundred fifty-one trillion, two hundred sixteen billion, three hundred thirteen million, two hundred twenty-one thousand, six hundred seventy-one".