3641447826721 has 4 divisors (see below), whose sum is σ = 3695797794352. Its totient is φ = 3587097859092.

The previous prime is 3641447826629. The next prime is 3641447826749. The reversal of 3641447826721 is 1276287441463.

It is a happy number.

3641447826721 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3641447826721 - 2¹³ = 3641447818529 is a prime.

It is a super-2 number, since 2×3641447826721² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3641447826221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27174983715 + ... + 27174983848.

It is an arithmetic number, because the mean of its divisors is an integer number (923949448588).

Almost surely, 2^{3641447826721} is an apocalyptic number.

It is an amenable number.

3641447826721 is a deficient number, since it is larger than the sum of its proper divisors (54349967631).

3641447826721 is an equidigital number, since it uses as much as digits as its factorization.

3641447826721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54349967630.

The product of its digits is 10838016, while the sum is 55.

The spelling of 3641447826721 in words is "three trillion, six hundred forty-one billion, four hundred forty-seven million, eight hundred twenty-six thousand, seven hundred twenty-one".