40643954271617 has 2 divisors, whose sum is σ = 40643954271618. Its totient is φ = 40643954271616.

The previous prime is 40643954271611. The next prime is 40643954271667. The reversal of 40643954271617 is 71617245934604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24707898255616 + 15936056016001 = 4970704^2 + 3991999^2 .

It is a cyclic number.

It is not a de Polignac number, because 40643954271617 - 2¹⁸ = 40643954009473 is a prime.

It is not a weakly prime, because it can be changed into another prime (40643954271611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20321977135808 + 20321977135809.

It is an arithmetic number, because the mean of its divisors is an integer number (20321977135809).

Almost surely, 2^{40643954271617} is an apocalyptic number.

It is an amenable number.

40643954271617 is a deficient number, since it is larger than the sum of its proper divisors (1).

40643954271617 is an equidigital number, since it uses as much as digits as its factorization.

40643954271617 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 40643954271617 in words is "forty trillion, six hundred forty-three billion, nine hundred fifty-four million, two hundred seventy-one thousand, six hundred seventeen".