515023421293649 has 2 divisors, whose sum is σ = 515023421293650. Its totient is φ = 515023421293648.

The previous prime is 515023421293637. The next prime is 515023421293673. The reversal of 515023421293649 is 946392124320515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445768269900625 + 69255151393024 = 21113225^2 + 8321968^2 .

It is a cyclic number.

It is not a de Polignac number, because 515023421293649 - 2²⁴ = 515023404516433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 515023421293594 and 515023421293603.

It is not a weakly prime, because it can be changed into another prime (515023421293609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257511710646824 + 257511710646825.

It is an arithmetic number, because the mean of its divisors is an integer number (257511710646825).

Almost surely, 2^{515023421293649} is an apocalyptic number.

It is an amenable number.

515023421293649 is a deficient number, since it is larger than the sum of its proper divisors (1).

515023421293649 is an equidigital number, since it uses as much as digits as its factorization.

515023421293649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13996800, while the sum is 56.

The spelling of 515023421293649 in words is "five hundred fifteen trillion, twenty-three billion, four hundred twenty-one million, two hundred ninety-three thousand, six hundred forty-nine".