40651817057865 has 160 divisors (see below), whose sum is σ = 87467404590720. Its totient is φ = 17844588251136.

The previous prime is 40651817057861. The next prime is 40651817057909. The reversal of 40651817057865 is 56875071815604.

It is a happy number.

40651817057865 is a `hidden beast` number, since 4 + 0 + 6 + 51 + 8 + 1 + 7 + 0 + 578 + 6 + 5 = 666.

It is not a de Polignac number, because 40651817057865 - 2² = 40651817057861 is a prime.

It is a super-2 number, since 2×40651817057865² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40651817057861) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 10251639 + ... + 13652828.

It is an arithmetic number, because the mean of its divisors is an integer number (546671278692).

Almost surely, 2^{40651817057865} is an apocalyptic number.

40651817057865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40651817057865 is an abundant number, since it is smaller than the sum of its proper divisors (46815587532855).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40651817057865 is a wasteful number, since it uses less digits than its factorization.

40651817057865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23904533 (or 23904524 counting only the distinct ones).

The product of its (nonzero) digits is 56448000, while the sum is 63.

The spelling of 40651817057865 in words is "forty trillion, six hundred fifty-one billion, eight hundred seventeen million, fifty-seven thousand, eight hundred sixty-five".