641877955988 has 12 divisors (see below), whose sum is σ = 1123298020992. Its totient is φ = 320935664280.

The previous prime is 641877955963. The next prime is 641877956011. The reversal of 641877955988 is 889559778146.

It is a super-2 number, since 2×641877955988² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363620 + ... + 1189947.

It is an arithmetic number, because the mean of its divisors is an integer number (93608168416).

Almost surely, 2^641877955988 is an apocalyptic number.

It is an amenable number.

641877955988 is a deficient number, since it is larger than the sum of its proper divisors (481420065004).

641877955988 is a wasteful number, since it uses less digits than its factorization.

641877955988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656862 (or 1656860 counting only the distinct ones).

The product of its digits is 1219276800, while the sum is 77.

The spelling of 641877955988 in words is "six hundred forty-one billion, eight hundred seventy-seven million, nine hundred fifty-five thousand, nine hundred eighty-eight".