641502157481 has 2 divisors, whose sum is σ = 641502157482. Its totient is φ = 641502157480.

The previous prime is 641502157469. The next prime is 641502157501. The reversal of 641502157481 is 184751205146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483588114025 + 157914043456 = 695405^2 + 397384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641502157481 is a prime.

It is a super-2 number, since 2×641502157481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641502157441) 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 as a sum of consecutive naturals, namely, 320751078740 + 320751078741.

It is an arithmetic number, because the mean of its divisors is an integer number (320751078741).

Almost surely, 2^641502157481 is an apocalyptic number.

It is an amenable number.

641502157481 is a deficient number, since it is larger than the sum of its proper divisors (1).

641502157481 is an equidigital number, since it uses as much as digits as its factorization.

641502157481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 641502157481 in words is "six hundred forty-one billion, five hundred two million, one hundred fifty-seven thousand, four hundred eighty-one".