40978923399646 has 8 divisors (see below), whose sum is σ = 61668607853160. Its totient is φ = 20422720781928.

The previous prime is 40978923399643. The next prime is 40978923399703. The reversal of 40978923399646 is 64699332987904.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40978923399643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33370458181 + ... + 33370459408.

It is an arithmetic number, because the mean of its divisors is an integer number (7708575981645).

Almost surely, 2^{40978923399646} is an apocalyptic number.

40978923399646 is a deficient number, since it is larger than the sum of its proper divisors (20689684453514).

40978923399646 is a wasteful number, since it uses less digits than its factorization.

40978923399646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66740917898.

The product of its (nonzero) digits is 3809369088, while the sum is 79.

The spelling of 40978923399646 in words is "forty trillion, nine hundred seventy-eight billion, nine hundred twenty-three million, three hundred ninety-nine thousand, six hundred forty-six".