44401621661621 has 4 divisors (see below), whose sum is σ = 50744710470432. Its totient is φ = 38058532852812.

The previous prime is 44401621661581. The next prime is 44401621661629. The reversal of 44401621661621 is 12616612610444.

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 44401621661621 - 2¹⁰ = 44401621660597 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 (44401621661629) 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, 3171544404395 + ... + 3171544404408.

It is an arithmetic number, because the mean of its divisors is an integer number (12686177617608).

Almost surely, 2^{44401621661621} is an apocalyptic number.

It is an amenable number.

44401621661621 is a deficient number, since it is larger than the sum of its proper divisors (6343088808811).

44401621661621 is an equidigital number, since it uses as much as digits as its factorization.

44401621661621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6343088808810.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 44401621661621 in words is "forty-four trillion, four hundred one billion, six hundred twenty-one million, six hundred sixty-one thousand, six hundred twenty-one".