3651384664821 has 8 divisors (see below), whose sum is σ = 5025561689344. Its totient is φ = 2355732041760.

The previous prime is 3651384664799. The next prime is 3651384664849. The reversal of 3651384664821 is 1284664831563.

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

It is not a de Polignac number, because 3651384664821 - 2²⁶ = 3651317555957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651384664891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19631100256 + ... + 19631100441.

It is an arithmetic number, because the mean of its divisors is an integer number (628195211168).

Almost surely, 2^{3651384664821} is an apocalyptic number.

3651384664821 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3651384664821 is a deficient number, since it is larger than the sum of its proper divisors (1374177024523).

3651384664821 is a wasteful number, since it uses less digits than its factorization.

3651384664821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39262200731.

The product of its digits is 19906560, while the sum is 57.

The spelling of 3651384664821 in words is "three trillion, six hundred fifty-one billion, three hundred eighty-four million, six hundred sixty-four thousand, eight hundred twenty-one".