1253478189779 has 2 divisors, whose sum is σ = 1253478189780. Its totient is φ = 1253478189778.

The previous prime is 1253478189731. The next prime is 1253478189797. The reversal of 1253478189779 is 9779818743521.

Together with next prime (1253478189797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1253478189779 - 2¹⁶ = 1253478124243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1253478189709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626739094889 + 626739094890.

It is an arithmetic number, because the mean of its divisors is an integer number (626739094890).

Almost surely, 2^{1253478189779} is an apocalyptic number.

1253478189779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253478189779 is an equidigital number, since it uses as much as digits as its factorization.

1253478189779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 213373440, while the sum is 71.

The spelling of 1253478189779 in words is "one trillion, two hundred fifty-three billion, four hundred seventy-eight million, one hundred eighty-nine thousand, seven hundred seventy-nine".