1641011645 has 32 divisors (see below), whose sum is σ = 2433473280. Its totient is φ = 1034496000.

The previous prime is 1641011641. The next prime is 1641011653. The reversal of 1641011645 is 5461101461.

It is a happy number.

It is not a de Polignac number, because 1641011645 - 2² = 1641011641 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641011641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107021 + ... + 121389.

It is an arithmetic number, because the mean of its divisors is an integer number (76046040).

Almost surely, 2^1641011645 is an apocalyptic number.

It is an amenable number.

1641011645 is a deficient number, since it is larger than the sum of its proper divisors (792461635).

1641011645 is a wasteful number, since it uses less digits than its factorization.

1641011645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14645.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1641011645 is about 40509.4019333784. The cubic root of 1641011645 is about 1179.5161391180.

The spelling of 1641011645 in words is "one billion, six hundred forty-one million, eleven thousand, six hundred forty-five".