3693721645 has 8 divisors (see below), whose sum is σ = 4433425920. Its totient is φ = 2954337360.

The previous prime is 3693721637. The next prime is 3693721663. The reversal of 3693721645 is 5461273963.

3693721645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3693721645 - 2³ = 3693721637 is a prime.

It is a super-3 number, since 3×3693721645³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3693721595 and 3693721604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53821 + ... + 101410.

It is an arithmetic number, because the mean of its divisors is an integer number (554178240).

Almost surely, 2^3693721645 is an apocalyptic number.

It is an amenable number.

3693721645 is a deficient number, since it is larger than the sum of its proper divisors (739704275).

3693721645 is a wasteful number, since it uses less digits than its factorization.

3693721645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159995.

The product of its digits is 816480, while the sum is 46.

The square root of 3693721645 is about 60775.9956314991. The cubic root of 3693721645 is about 1545.8050488952.

The spelling of 3693721645 in words is "three billion, six hundred ninety-three million, seven hundred twenty-one thousand, six hundred forty-five".