40521487190689 has 2 divisors, whose sum is σ = 40521487190690. Its totient is φ = 40521487190688.

The previous prime is 40521487190687. The next prime is 40521487190713. The reversal of 40521487190689 is 98609178412504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31521577190464 + 8999910000225 = 5614408^2 + 2999985^2 .

It is a cyclic number.

It is not a de Polignac number, because 40521487190689 - 2¹ = 40521487190687 is a prime.

Together with 40521487190687, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40521487190689.

It is not a weakly prime, because it can be changed into another prime (40521487190687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20260743595344 + 20260743595345.

It is an arithmetic number, because the mean of its divisors is an integer number (20260743595345).

Almost surely, 2^{40521487190689} is an apocalyptic number.

It is an amenable number.

40521487190689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40521487190689 is an equidigital number, since it uses as much as digits as its factorization.

40521487190689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 64.

The spelling of 40521487190689 in words is "forty trillion, five hundred twenty-one billion, four hundred eighty-seven million, one hundred ninety thousand, six hundred eighty-nine".