641209662061600 has 576 divisors, whose sum is σ = 1668184889333760. Its totient is φ = 240170185728000.

The previous prime is 641209662061559. The next prime is 641209662061673. The reversal of 641209662061600 is 6160266902146.

It is a super-2 number, since 2×641209662061600² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 129511139125 + ... + 129511144075.

It is an arithmetic number, because the mean of its divisors is an integer number (2896154321760).

Almost surely, 2^{641209662061600} 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 641209662061600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834092444666880).

641209662061600 is an abundant number, since it is smaller than the sum of its proper divisors (1026975227272160).

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

641209662061600 is a wasteful number, since it uses less digits than its factorization.

641209662061600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5833 (or 5820 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 641209662061600 in words is "six hundred forty-one trillion, two hundred nine billion, six hundred sixty-two million, sixty-one thousand, six hundred".