40265648721 has 8 divisors (see below), whose sum is σ = 59652812960. Its totient is φ = 26843765796.

The previous prime is 40265648699. The next prime is 40265648737. The reversal of 40265648721 is 12784656204.

40265648721 is a `hidden beast` number, since 4 + 0 + 2 + 6 + 564 + 87 + 2 + 1 = 666.

It is not a de Polignac number, because 40265648721 - 2⁹ = 40265648209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40265648021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745660135 + ... + 745660188.

It is an arithmetic number, because the mean of its divisors is an integer number (7456601620).

Almost surely, 2^40265648721 is an apocalyptic number.

It is an amenable number.

40265648721 is a deficient number, since it is larger than the sum of its proper divisors (19387164239).

40265648721 is a wasteful number, since it uses less digits than its factorization.

40265648721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491320332 (or 1491320326 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 40265648721 in words is "forty billion, two hundred sixty-five million, six hundred forty-eight thousand, seven hundred twenty-one".