641602187537 has 4 divisors (see below), whose sum is σ = 643869333360. Its totient is φ = 639335041716.

The previous prime is 641602187489. The next prime is 641602187561. The reversal of 641602187537 is 735781206146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641602187537 - 2²² = 641597993233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641602187137) 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, 1133572487 + ... + 1133573052.

It is an arithmetic number, because the mean of its divisors is an integer number (160967333340).

Almost surely, 2^641602187537 is an apocalyptic number.

It is an amenable number.

641602187537 is a deficient number, since it is larger than the sum of its proper divisors (2267145823).

641602187537 is a wasteful number, since it uses less digits than its factorization.

641602187537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267145822.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 641602187537 in words is "six hundred forty-one billion, six hundred two million, one hundred eighty-seven thousand, five hundred thirty-seven".