641155694 has 4 divisors (see below), whose sum is σ = 961733544. Its totient is φ = 320577846.

The previous prime is 641155687. The next prime is 641155699. The reversal of 641155694 is 496551146.

641155694 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×641155694² = 822161247897243272, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641155699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160288922 + ... + 160288925.

It is an arithmetic number, because the mean of its divisors is an integer number (240433386).

Almost surely, 2^641155694 is an apocalyptic number.

641155694 is a deficient number, since it is larger than the sum of its proper divisors (320577850).

641155694 is a wasteful number, since it uses less digits than its factorization.

641155694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320577849.

The product of its digits is 129600, while the sum is 41.

The square root of 641155694 is about 25321.0523872923. The cubic root of 641155694 is about 862.2922864368.

The spelling of 641155694 in words is "six hundred forty-one million, one hundred fifty-five thousand, six hundred ninety-four".