40697815666385 has 16 divisors (see below), whose sum is σ = 48854790880896. Its totient is φ = 32546646246528.

The previous prime is 40697815666369. The next prime is 40697815666439. The reversal of 40697815666385 is 58366651879604.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40697815666385 - 2⁴ = 40697815666369 is a prime.

It is a Duffinian number.

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, 196383692 + ... + 196590818.

It is an arithmetic number, because the mean of its divisors is an integer number (3053424430056).

Almost surely, 2^{40697815666385} is an apocalyptic number.

It is an amenable number.

40697815666385 is a deficient number, since it is larger than the sum of its proper divisors (8156975214511).

40697815666385 is a wasteful number, since it uses less digits than its factorization.

40697815666385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220952.

The product of its (nonzero) digits is 1567641600, while the sum is 74.

The spelling of 40697815666385 in words is "forty trillion, six hundred ninety-seven billion, eight hundred fifteen million, six hundred sixty-six thousand, three hundred eighty-five".