40401165544 has 8 divisors (see below), whose sum is σ = 75752185410. Its totient is φ = 20200582768.

The previous prime is 40401165509. The next prime is 40401165547. The reversal of 40401165544 is 44556110404.

It can be written as a sum of positive squares in only one way, i.e., 25587841444 + 14813324100 = 159962^2 + 121710^2 .

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

It is not an unprimeable number, because it can be changed into a prime (40401165547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2525072839 + ... + 2525072854.

Almost surely, 2^40401165544 is an apocalyptic number.

It is an amenable number.

40401165544 is a deficient number, since it is larger than the sum of its proper divisors (35351019866).

40401165544 is a wasteful number, since it uses less digits than its factorization.

40401165544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050145699 (or 5050145695 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 40401165544 its reverse (44556110404), we get a palindrome (84957275948).

The spelling of 40401165544 in words is "forty billion, four hundred one million, one hundred sixty-five thousand, five hundred forty-four".