641152624261 has 4 divisors (see below), whose sum is σ = 641232606412. Its totient is φ = 641072642112.

The previous prime is 641152624243. The next prime is 641152624271. The reversal of 641152624261 is 162426251146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162426251146 = 2 ⋅81213125573.

It can be written as a sum of positive squares in 2 ways, for example, as 170378247361 + 470774376900 = 412769^2 + 686130^2 .

It is a cyclic number.

It is not a de Polignac number, because 641152624261 - 2¹⁵ = 641152591493 is a prime.

It is a super-2 number, since 2×641152624261² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641152624271) by changing a digit.

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, 39979050 + ... + 39995083.

It is an arithmetic number, because the mean of its divisors is an integer number (160308151603).

Almost surely, 2^641152624261 is an apocalyptic number.

It is an amenable number.

641152624261 is a deficient number, since it is larger than the sum of its proper divisors (79982151).

641152624261 is an equidigital number, since it uses as much as digits as its factorization.

641152624261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79982150.

The product of its digits is 138240, while the sum is 40.

The spelling of 641152624261 in words is "six hundred forty-one billion, one hundred fifty-two million, six hundred twenty-four thousand, two hundred sixty-one".