641495554978 has 16 divisors (see below), whose sum is σ = 1004374437696. Its totient is φ = 306712254640.

The previous prime is 641495554967. The next prime is 641495555087. The reversal of 641495554978 is 879455594146.

641495554978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1886008 + ... + 2200003.

It is an arithmetic number, because the mean of its divisors is an integer number (62773402356).

Almost surely, 2^641495554978 is an apocalyptic number.

641495554978 is a deficient number, since it is larger than the sum of its proper divisors (362878882718).

641495554978 is a wasteful number, since it uses less digits than its factorization.

641495554978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089449.

The product of its digits is 217728000, while the sum is 67.

The spelling of 641495554978 in words is "six hundred forty-one billion, four hundred ninety-five million, five hundred fifty-four thousand, nine hundred seventy-eight".