256734145452619 has 2 divisors, whose sum is σ = 256734145452620. Its totient is φ = 256734145452618.

The previous prime is 256734145452607. The next prime is 256734145452679. The reversal of 256734145452619 is 916254541437652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256734145452619 - 2³³ = 256725555518027 is a prime.

It is a super-2 number, since 2×256734145452619² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256734145452679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128367072726309 + 128367072726310.

It is an arithmetic number, because the mean of its divisors is an integer number (128367072726310).

Almost surely, 2^{256734145452619} is an apocalyptic number.

256734145452619 is a deficient number, since it is larger than the sum of its proper divisors (1).

256734145452619 is an equidigital number, since it uses as much as digits as its factorization.

256734145452619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728000, while the sum is 64.

The spelling of 256734145452619 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, one hundred forty-five million, four hundred fifty-two thousand, six hundred nineteen".