251422426616605 has 4 divisors (see below), whose sum is σ = 301706911939932. Its totient is φ = 201137941293280.

The previous prime is 251422426616593. The next prime is 251422426616639. The reversal of 251422426616605 is 506616624224152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152606639800836 + 98815786815769 = 12353406^2 + 9940613^2 .

It is not a de Polignac number, because 251422426616605 - 2¹⁹ = 251422426092317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25142242661656 + ... + 25142242661665.

It is an arithmetic number, because the mean of its divisors is an integer number (75426727984983).

Almost surely, 2^{251422426616605} is an apocalyptic number.

It is an amenable number.

251422426616605 is a deficient number, since it is larger than the sum of its proper divisors (50284485323327).

251422426616605 is an equidigital number, since it uses as much as digits as its factorization.

251422426616605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50284485323326.

The product of its (nonzero) digits is 8294400, while the sum is 52.

The spelling of 251422426616605 in words is "two hundred fifty-one trillion, four hundred twenty-two billion, four hundred twenty-six million, six hundred sixteen thousand, six hundred five".