840197722464 has 144 divisors (see below), whose sum is σ = 2396747873520. Its totient is φ = 279195586560.

The previous prime is 840197722433. The next prime is 840197722523. The reversal of 840197722464 is 464227791048.

840197722464 is a `hidden beast` number, since 8 + 401 + 9 + 7 + 7 + 224 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 840197722464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177666852 + ... + 177671580.

It is an arithmetic number, because the mean of its divisors is an integer number (16644082455).

Almost surely, 2^840197722464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840197722464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198373936760).

840197722464 is an abundant number, since it is smaller than the sum of its proper divisors (1556550151056).

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

840197722464 is a wasteful number, since it uses less digits than its factorization.

840197722464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6533 (or 6522 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 840197722464 in words is "eight hundred forty billion, one hundred ninety-seven million, seven hundred twenty-two thousand, four hundred sixty-four".