4009781693685 has 64 divisors (see below), whose sum is σ = 6709381620480. Its totient is φ = 2042277027840.

The previous prime is 4009781693669. The next prime is 4009781693737. The reversal of 4009781693685 is 5863961879004.

It is not a de Polignac number, because 4009781693685 - 2⁴ = 4009781693669 is a prime.

It is a super-2 number, since 2×4009781693685² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71408070 + ... + 71464200.

It is an arithmetic number, because the mean of its divisors is an integer number (104834087820).

Almost surely, 2^{4009781693685} is an apocalyptic number.

It is an amenable number.

4009781693685 is a deficient number, since it is larger than the sum of its proper divisors (2699599926795).

4009781693685 is a wasteful number, since it uses less digits than its factorization.

4009781693685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57958.

The product of its (nonzero) digits is 78382080, while the sum is 66.

The spelling of 4009781693685 in words is "four trillion, nine billion, seven hundred eighty-one million, six hundred ninety-three thousand, six hundred eighty-five".