641766141 has 18 divisors (see below), whose sum is σ = 939938298. Its totient is φ = 421951680.

The previous prime is 641766127. The next prime is 641766149. The reversal of 641766141 is 141667146.

It is a happy number.

641766141 is a `hidden beast` number, since 641 + 7 + 6 + 6 + 1 + 4 + 1 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 38081241 + 603684900 = 6171^2 + 24570^2 .

It is not a de Polignac number, because 641766141 - 2⁶ = 641766077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 641766096 and 641766105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641766149) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 41271 + ... + 54651.

Almost surely, 2^641766141 is an apocalyptic number.

It is an amenable number.

641766141 is a deficient number, since it is larger than the sum of its proper divisors (298172157).

641766141 is a wasteful number, since it uses less digits than its factorization.

641766141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13533 (or 13457 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 641766141 is about 25333.1036590466. The cubic root of 641766141 is about 862.5658636533.

The spelling of 641766141 in words is "six hundred forty-one million, seven hundred sixty-six thousand, one hundred forty-one".