43681560975397 has 2 divisors, whose sum is σ = 43681560975398. Its totient is φ = 43681560975396.

The previous prime is 43681560975337. The next prime is 43681560975401. The reversal of 43681560975397 is 79357906518634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43274109829636 + 407451145761 = 6578306^2 + 638319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43681560975397 is a prime.

It is a super-2 number, since 2×43681560975397² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43681560975337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21840780487698 + 21840780487699.

It is an arithmetic number, because the mean of its divisors is an integer number (21840780487699).

Almost surely, 2^{43681560975397} is an apocalyptic number.

It is an amenable number.

43681560975397 is a deficient number, since it is larger than the sum of its proper divisors (1).

43681560975397 is an equidigital number, since it uses as much as digits as its factorization.

43681560975397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1028764800, while the sum is 73.

The spelling of 43681560975397 in words is "forty-three trillion, six hundred eighty-one billion, five hundred sixty million, nine hundred seventy-five thousand, three hundred ninety-seven".