40064003521 has 2 divisors, whose sum is σ = 40064003522. Its totient is φ = 40064003520.

The previous prime is 40064003519. The next prime is 40064003537. The reversal of 40064003521 is 12530046004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22938617025 + 17125386496 = 151455^2 + 130864^2 .

It is a cyclic number.

It is not a de Polignac number, because 40064003521 - 2¹ = 40064003519 is a prime.

Together with 40064003519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40064003621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20032001760 + 20032001761.

It is an arithmetic number, because the mean of its divisors is an integer number (20032001761).

Almost surely, 2^40064003521 is an apocalyptic number.

It is an amenable number.

40064003521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40064003521 is an equidigital number, since it uses as much as digits as its factorization.

40064003521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 40064003521 its reverse (12530046004), we get a palindrome (52594049525).

The spelling of 40064003521 in words is "forty billion, sixty-four million, three thousand, five hundred twenty-one".