40356320665 has 16 divisors (see below), whose sum is σ = 49258834560. Its totient is φ = 31731122560.

The previous prime is 40356320659. The next prime is 40356320677. The reversal of 40356320665 is 56602365304.

40356320665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40356320665 - 2⁵ = 40356320633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1736925 + ... + 1760005.

It is an arithmetic number, because the mean of its divisors is an integer number (3078677160).

Almost surely, 2^40356320665 is an apocalyptic number.

It is an amenable number.

40356320665 is a deficient number, since it is larger than the sum of its proper divisors (8902513895).

40356320665 is a wasteful number, since it uses less digits than its factorization.

40356320665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29072.

The product of its (nonzero) digits is 388800, while the sum is 40.

Adding to 40356320665 its reverse (56602365304), we get a palindrome (96958685969).

The spelling of 40356320665 in words is "forty billion, three hundred fifty-six million, three hundred twenty thousand, six hundred sixty-five".