641557334240 has 96 divisors (see below), whose sum is σ = 1605594148704. Its totient is φ = 241413488640.

The previous prime is 641557334221. The next prime is 641557334263. The reversal of 641557334240 is 42433755146.

It is a junction number, because it is equal to n+sod(n) for n = 641557334191 and 641557334200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5823347 + ... + 5932493.

It is an arithmetic number, because the mean of its divisors is an integer number (16724939049).

Almost surely, 2^641557334240 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 641557334240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802797074352).

641557334240 is an abundant number, since it is smaller than the sum of its proper divisors (964036814464).

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

641557334240 is a wasteful number, since it uses less digits than its factorization.

641557334240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111340 (or 111332 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 44.

The spelling of 641557334240 in words is "six hundred forty-one billion, five hundred fifty-seven million, three hundred thirty-four thousand, two hundred forty".