641166393 has 16 divisors (see below), whose sum is σ = 993576960. Its totient is φ = 360170256.

The previous prime is 641166391. The next prime is 641166437. The reversal of 641166393 is 393661146.

It is not a de Polignac number, because 641166393 - 2¹ = 641166391 is a prime.

It is a super-2 number, since 2×641166393² = 822188687025260898, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641166391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257505 + ... + 259982.

It is an arithmetic number, because the mean of its divisors is an integer number (62098560).

Almost surely, 2^641166393 is an apocalyptic number.

It is an amenable number.

641166393 is a deficient number, since it is larger than the sum of its proper divisors (352410567).

641166393 is a wasteful number, since it uses less digits than its factorization.

641166393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517556.

The product of its digits is 69984, while the sum is 39.

The square root of 641166393 is about 25321.2636533013. The cubic root of 641166393 is about 862.2970827830.

The spelling of 641166393 in words is "six hundred forty-one million, one hundred sixty-six thousand, three hundred ninety-three".