840201916644 has 36 divisors (see below), whose sum is σ = 2124447933244. Its totient is φ = 279987630912.

The previous prime is 840201916643. The next prime is 840201916657. The reversal of 840201916644 is 446619102048.

It can be written as a sum of positive squares in 2 ways, for example, as 341186828544 + 499015088100 = 584112^2 + 706410^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×840201916644² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 840201916644.

It is not an unprimeable number, because it can be changed into a prime (840201916643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3191407 + ... + 3444630.

Almost surely, 2^840201916644 is an apocalyptic number.

It is an amenable number.

840201916644 is an abundant number, since it is smaller than the sum of its proper divisors (1284246016600).

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

840201916644 is a wasteful number, since it uses less digits than its factorization.

840201916644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6639564 (or 6639559 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 840201916644 in words is "eight hundred forty billion, two hundred one million, nine hundred sixteen thousand, six hundred forty-four".