40402561064 has 8 divisors (see below), whose sum is σ = 75754802010. Its totient is φ = 20201280528.

The previous prime is 40402561061. The next prime is 40402561081. The reversal of 40402561064 is 46016520404.

It can be written as a sum of positive squares in only one way, i.e., 39743612164 + 658948900 = 199358^2 + 25670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 40402561064.

It is not an unprimeable number, because it can be changed into a prime (40402561061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2525160059 + ... + 2525160074.

Almost surely, 2^40402561064 is an apocalyptic number.

It is an amenable number.

40402561064 is a deficient number, since it is larger than the sum of its proper divisors (35352240946).

40402561064 is a wasteful number, since it uses less digits than its factorization.

40402561064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050320139 (or 5050320135 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 40402561064 in words is "forty billion, four hundred two million, five hundred sixty-one thousand, sixty-four".