921966073440 has 48 divisors (see below), whose sum is σ = 2904193132848. Its totient is φ = 245857619456.

The previous prime is 921966073397. The next prime is 921966073459. The reversal of 921966073440 is 44370669129.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 960380847 + ... + 960381806.

It is an arithmetic number, because the mean of its divisors is an integer number (60504023601).

Almost surely, 2^921966073440 is an apocalyptic number.

It is an amenable number.

921966073440 is an abundant number, since it is smaller than the sum of its proper divisors (1982227059408).

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

921966073440 is a wasteful number, since it uses less digits than its factorization.

921966073440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920762671 (or 1920762663 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 921966073440 in words is "nine hundred twenty-one billion, nine hundred sixty-six million, seventy-three thousand, four hundred forty".