641680626248 has 8 divisors (see below), whose sum is σ = 1203151174230. Its totient is φ = 320840313120.

The previous prime is 641680626233. The next prime is 641680626311. The reversal of 641680626248 is 842626086146.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 617044812484 + 24635813764 = 785522^2 + 156958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×641680626248² (a number of 24 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 641680626248.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40105039133 + ... + 40105039148.

Almost surely, 2^641680626248 is an apocalyptic number.

It is an amenable number.

641680626248 is a deficient number, since it is larger than the sum of its proper divisors (561470547982).

641680626248 is a wasteful number, since it uses less digits than its factorization.

641680626248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80210078287 (or 80210078283 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 53.

The spelling of 641680626248 in words is "six hundred forty-one billion, six hundred eighty million, six hundred twenty-six thousand, two hundred forty-eight".