251416621066531 has 2 divisors, whose sum is σ = 251416621066532. Its totient is φ = 251416621066530.

The previous prime is 251416621066393. The next prime is 251416621066591. The reversal of 251416621066531 is 135660126614152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251416621066531 is a prime.

It is a super-2 number, since 2×251416621066531² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251416621066591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125708310533265 + 125708310533266.

It is an arithmetic number, because the mean of its divisors is an integer number (125708310533266).

Almost surely, 2^{251416621066531} is an apocalyptic number.

251416621066531 is a deficient number, since it is larger than the sum of its proper divisors (1).

251416621066531 is an equidigital number, since it uses as much as digits as its factorization.

251416621066531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 251416621066531 in words is "two hundred fifty-one trillion, four hundred sixteen billion, six hundred twenty-one million, sixty-six thousand, five hundred thirty-one".