251687066419 has 2 divisors, whose sum is σ = 251687066420. Its totient is φ = 251687066418.

The previous prime is 251687066383. The next prime is 251687066431. The reversal of 251687066419 is 914660786152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251687066419 - 2¹¹ = 251687064371 is a prime.

It is a super-2 number, since 2×251687066419² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251687066419.

It is not a weakly prime, because it can be changed into another prime (251687066479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125843533209 + 125843533210.

It is an arithmetic number, because the mean of its divisors is an integer number (125843533210).

Almost surely, 2^251687066419 is an apocalyptic number.

251687066419 is a deficient number, since it is larger than the sum of its proper divisors (1).

251687066419 is an equidigital number, since it uses as much as digits as its factorization.

251687066419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 251687066419 in words is "two hundred fifty-one billion, six hundred eighty-seven million, sixty-six thousand, four hundred nineteen".