641940845 has 16 divisors (see below), whose sum is σ = 948097920. Its totient is φ = 406327104.

The previous prime is 641940811. The next prime is 641940907. The reversal of 641940845 is 548049146.

It is a cyclic number.

It is not a de Polignac number, because 641940845 - 2¹² = 641936749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 704975 + ... + 705884.

It is an arithmetic number, because the mean of its divisors is an integer number (59256120).

Almost surely, 2^641940845 is an apocalyptic number.

641940845 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

641940845 is a deficient number, since it is larger than the sum of its proper divisors (306157075).

641940845 is a wasteful number, since it uses less digits than its factorization.

641940845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410884.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 641940845 is about 25336.5515609366. The cubic root of 641940845 is about 862.6441268632.

The spelling of 641940845 in words is "six hundred forty-one million, nine hundred forty thousand, eight hundred forty-five".