43504687697 has 2 divisors, whose sum is σ = 43504687698. Its totient is φ = 43504687696.

The previous prime is 43504687687. The next prime is 43504687717. The reversal of 43504687697 is 79678640534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43326838801 + 177848896 = 208151^2 + 13336^2 .

It is a cyclic number.

It is not a de Polignac number, because 43504687697 - 2⁸ = 43504687441 is a prime.

It is a super-2 number, since 2×43504687697² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43504687627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21752343848 + 21752343849.

It is an arithmetic number, because the mean of its divisors is an integer number (21752343849).

Almost surely, 2^43504687697 is an apocalyptic number.

It is an amenable number.

43504687697 is a deficient number, since it is larger than the sum of its proper divisors (1).

43504687697 is an equidigital number, since it uses as much as digits as its factorization.

43504687697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 43504687697 in words is "forty-three billion, five hundred four million, six hundred eighty-seven thousand, six hundred ninety-seven".