641954267137 has 4 divisors (see below), whose sum is σ = 643772834820. Its totient is φ = 640135699456.

The previous prime is 641954267083. The next prime is 641954267153. The reversal of 641954267137 is 731762459146.

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

It can be written as a sum of positive squares in 2 ways, for example, as 358460848656 + 283493418481 = 598716^2 + 532441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641954267137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641954262137) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 909283312 + ... + 909284017.

It is an arithmetic number, because the mean of its divisors is an integer number (160943208705).

Almost surely, 2^641954267137 is an apocalyptic number.

It is an amenable number.

641954267137 is a deficient number, since it is larger than the sum of its proper divisors (1818567683).

641954267137 is a wasteful number, since it uses less digits than its factorization.

641954267137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818567682.

The product of its digits is 7620480, while the sum is 55.

The spelling of 641954267137 in words is "six hundred forty-one billion, nine hundred fifty-four million, two hundred sixty-seven thousand, one hundred thirty-seven".