7423768161581 has 2 divisors, whose sum is σ = 7423768161582. Its totient is φ = 7423768161580.

The previous prime is 7423768161553. The next prime is 7423768161613. The reversal of 7423768161581 is 1851618673247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6701191659556 + 722576502025 = 2588666^2 + 850045^2 .

It is a cyclic number.

It is not a de Polignac number, because 7423768161581 - 2¹⁸ = 7423767899437 is a prime.

It is a super-2 number, since 2×7423768161581² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7423768161581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7423768161281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3711884080790 + 3711884080791.

It is an arithmetic number, because the mean of its divisors is an integer number (3711884080791).

Almost surely, 2^{7423768161581} is an apocalyptic number.

It is an amenable number.

7423768161581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7423768161581 is an equidigital number, since it uses as much as digits as its factorization.

7423768161581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 59.

The spelling of 7423768161581 in words is "seven trillion, four hundred twenty-three billion, seven hundred sixty-eight million, one hundred sixty-one thousand, five hundred eighty-one".