40545664541521 has 2 divisors, whose sum is σ = 40545664541522. Its totient is φ = 40545664541520.

The previous prime is 40545664541383. The next prime is 40545664541537. The reversal of 40545664541521 is 12514546654504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24398768919121 + 16146895622400 = 4939511^2 + 4018320^2 .

It is a cyclic number.

It is not a de Polignac number, because 40545664541521 - 2⁹ = 40545664541009 is a prime.

It is a super-2 number, since 2×40545664541521² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40545664541581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20272832270760 + 20272832270761.

It is an arithmetic number, because the mean of its divisors is an integer number (20272832270761).

Almost surely, 2^{40545664541521} is an apocalyptic number.

It is an amenable number.

40545664541521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40545664541521 is an equidigital number, since it uses as much as digits as its factorization.

40545664541521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520000, while the sum is 52.

The spelling of 40545664541521 in words is "forty trillion, five hundred forty-five billion, six hundred sixty-four million, five hundred forty-one thousand, five hundred twenty-one".