40065250649 has 2 divisors, whose sum is σ = 40065250650. Its totient is φ = 40065250648.

The previous prime is 40065250601. The next prime is 40065250651. The reversal of 40065250649 is 94605256004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39481690000 + 583560649 = 198700^2 + 24157^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40065250649 is a prime.

Together with 40065250651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40065250349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20032625324 + 20032625325.

It is an arithmetic number, because the mean of its divisors is an integer number (20032625325).

Almost surely, 2^40065250649 is an apocalyptic number.

It is an amenable number.

40065250649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40065250649 is an equidigital number, since it uses as much as digits as its factorization.

40065250649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 40065250649 in words is "forty billion, sixty-five million, two hundred fifty thousand, six hundred forty-nine".