1253444543551 has 2 divisors, whose sum is σ = 1253444543552. Its totient is φ = 1253444543550.

The previous prime is 1253444543539. The next prime is 1253444543579. The reversal of 1253444543551 is 1553454443521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1253444543551 - 2²⁷ = 1253310325823 is a prime.

It is a super-2 number, since 2×1253444543551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253444543581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626722271775 + 626722271776.

It is an arithmetic number, because the mean of its divisors is an integer number (626722271776).

Almost surely, 2^{1253444543551} is an apocalyptic number.

1253444543551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253444543551 is an equidigital number, since it uses as much as digits as its factorization.

1253444543551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880000, while the sum is 46.

The spelling of 1253444543551 in words is "one trillion, two hundred fifty-three billion, four hundred forty-four million, five hundred forty-three thousand, five hundred fifty-one".