1015923261557 has 2 divisors, whose sum is σ = 1015923261558. Its totient is φ = 1015923261556.

The previous prime is 1015923261541. The next prime is 1015923261641. The reversal of 1015923261557 is 7551623295101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013553616516 + 2369645041 = 1006754^2 + 48679^2 .

It is an emirp because it is prime and its reverse (7551623295101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1015923261557 - 2⁴ = 1015923261541 is a prime.

It is a super-2 number, since 2×1015923261557² (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 (1015923261257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 507961630778 + 507961630779.

It is an arithmetic number, because the mean of its divisors is an integer number (507961630779).

Almost surely, 2^{1015923261557} is an apocalyptic number.

It is an amenable number.

1015923261557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1015923261557 is an equidigital number, since it uses as much as digits as its factorization.

1015923261557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 47.

The spelling of 1015923261557 in words is "one trillion, fifteen billion, nine hundred twenty-three million, two hundred sixty-one thousand, five hundred fifty-seven".