641409159779 has 4 divisors (see below), whose sum is σ = 669296514576. Its totient is φ = 613521804984.

The previous prime is 641409159773. The next prime is 641409159821. The reversal of 641409159779 is 977951904146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641409159779 - 2⁴ = 641409159763 is a prime.

It is a super-2 number, since 2×641409159779² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641409159773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13943677364 + ... + 13943677409.

It is an arithmetic number, because the mean of its divisors is an integer number (167324128644).

Almost surely, 2^641409159779 is an apocalyptic number.

641409159779 is a deficient number, since it is larger than the sum of its proper divisors (27887354797).

641409159779 is a wasteful number, since it uses less digits than its factorization.

641409159779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27887354796.

The product of its (nonzero) digits is 17146080, while the sum is 62.

The spelling of 641409159779 in words is "six hundred forty-one billion, four hundred nine million, one hundred fifty-nine thousand, seven hundred seventy-nine".