641285491392 has 1008 divisors, whose sum is σ = 2514418583040. Its totient is φ = 160181618688.

The previous prime is 641285491321. The next prime is 641285491423. The reversal of 641285491392 is 293194582146.

It is a happy number.

641285491392 is a `hidden beast` number, since 6 + 4 + 1 + 2 + 8 + 549 + 1 + 3 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a super-2 number, since 2×641285491392² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 188224153 + ... + 188227559.

It is an arithmetic number, because the mean of its divisors is an integer number (2494462880).

Almost surely, 2^641285491392 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 641285491392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1257209291520).

641285491392 is an abundant number, since it is smaller than the sum of its proper divisors (1873133091648).

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

641285491392 is a wasteful number, since it uses less digits than its factorization.

641285491392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480 (or 3451 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 641285491392 in words is "six hundred forty-one billion, two hundred eighty-five million, four hundred ninety-one thousand, three hundred ninety-two".