1640690968846 has 8 divisors (see below), whose sum is σ = 2527550952120. Its totient is φ = 798173984808.

The previous prime is 1640690968817. The next prime is 1640690968867. The reversal of 1640690968846 is 6488690960461.

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

It is a super-2 number, since 2×1640690968846² (a number of 25 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11085749716 + ... + 11085749863.

It is an arithmetic number, because the mean of its divisors is an integer number (315943869015).

Almost surely, 2^{1640690968846} is an apocalyptic number.

1640690968846 is a deficient number, since it is larger than the sum of its proper divisors (886859983274).

1640690968846 is a wasteful number, since it uses less digits than its factorization.

1640690968846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22171499618.

The product of its (nonzero) digits is 107495424, while the sum is 67.

The spelling of 1640690968846 in words is "one trillion, six hundred forty billion, six hundred ninety million, nine hundred sixty-eight thousand, eight hundred forty-six".