1251425415533 has 2 divisors, whose sum is σ = 1251425415534. Its totient is φ = 1251425415532.

The previous prime is 1251425415497. The next prime is 1251425415547. The reversal of 1251425415533 is 3355145241521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1041699885769 + 209725529764 = 1020637^2 + 457958^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251425415533 - 2²⁰ = 1251424366957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251425415593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625712707766 + 625712707767.

It is an arithmetic number, because the mean of its divisors is an integer number (625712707767).

Almost surely, 2^{1251425415533} is an apocalyptic number.

It is an amenable number.

1251425415533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251425415533 is an equidigital number, since it uses as much as digits as its factorization.

1251425415533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360000, while the sum is 41.

The spelling of 1251425415533 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-five million, four hundred fifteen thousand, five hundred thirty-three".