389722655521 has 4 divisors (see below), whose sum is σ = 389724544192. Its totient is φ = 389720766852.

The previous prime is 389722655507. The next prime is 389722655557. The reversal of 389722655521 is 125556227983.

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 389722655521 - 2⁵ = 389722655489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389722655561) 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, 590661 + ... + 1062226.

It is an arithmetic number, because the mean of its divisors is an integer number (97431136048).

Almost surely, 2^389722655521 is an apocalyptic number.

It is an amenable number.

389722655521 is a deficient number, since it is larger than the sum of its proper divisors (1888671).

389722655521 is a wasteful number, since it uses less digits than its factorization.

389722655521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888670.

The product of its digits is 9072000, while the sum is 55.

The spelling of 389722655521 in words is "three hundred eighty-nine billion, seven hundred twenty-two million, six hundred fifty-five thousand, five hundred twenty-one".