40649656321 has 2 divisors, whose sum is σ = 40649656322. Its totient is φ = 40649656320.

The previous prime is 40649656309. The next prime is 40649656361. The reversal of 40649656321 is 12365694604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40035607921 + 614048400 = 200089^2 + 24780^2 .

It is a cyclic number.

It is not a de Polignac number, because 40649656321 - 2⁷ = 40649656193 is a prime.

It is not a weakly prime, because it can be changed into another prime (40649656361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20324828160 + 20324828161.

It is an arithmetic number, because the mean of its divisors is an integer number (20324828161).

Almost surely, 2^40649656321 is an apocalyptic number.

It is an amenable number.

40649656321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40649656321 is an equidigital number, since it uses as much as digits as its factorization.

40649656321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 40649656321 in words is "forty billion, six hundred forty-nine million, six hundred fifty-six thousand, three hundred twenty-one".