40561365649 has 16 divisors (see below), whose sum is σ = 47986801920. Its totient is φ = 33545292480.

The previous prime is 40561365601. The next prime is 40561365703. The reversal of 40561365649 is 94656316504.

It is not a de Polignac number, because 40561365649 - 2⁷ = 40561365521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40561362649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236164 + ... + 369994.

It is an arithmetic number, because the mean of its divisors is an integer number (2999175120).

Almost surely, 2^40561365649 is an apocalyptic number.

It is an amenable number.

40561365649 is a deficient number, since it is larger than the sum of its proper divisors (7425436271).

40561365649 is a wasteful number, since it uses less digits than its factorization.

40561365649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135360.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 40561365649 in words is "forty billion, five hundred sixty-one million, three hundred sixty-five thousand, six hundred forty-nine".