641666146 has 12 divisors (see below), whose sum is σ = 1057954086. Its totient is φ = 291666320.

The previous prime is 641666143. The next prime is 641666149.

641666146 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (641666143) and next prime (641666149).

It can be written as a sum of positive squares in only one way, i.e., 612018121 + 29648025 = 24739^2 + 5445^2 .

It is a junction number, because it is equal to n+sod(n) for n = 641666099 and 641666108.

It is not an unprimeable number, because it can be changed into a prime (641666141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1325515 + ... + 1325998.

Almost surely, 2^641666146 is an apocalyptic number.

641666146 is a deficient number, since it is larger than the sum of its proper divisors (416287940).

641666146 is a wasteful number, since it uses less digits than its factorization.

641666146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651537 (or 2651526 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 641666146 is about 25331.1299787435. The cubic root of 641666146 is about 862.5210618955.

The spelling of 641666146 in words is "six hundred forty-one million, six hundred sixty-six thousand, one hundred forty-six".