621543729693 has 16 divisors (see below), whose sum is σ = 838748385216. Its totient is φ = 409351242240.

The previous prime is 621543729649. The next prime is 621543729727. The reversal of 621543729693 is 396927345126.

It is not a de Polignac number, because 621543729693 - 2¹³ = 621543721501 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621543729643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7137133 + ... + 7223693.

It is an arithmetic number, because the mean of its divisors is an integer number (52421774076).

Almost surely, 2^621543729693 is an apocalyptic number.

It is an amenable number.

621543729693 is a deficient number, since it is larger than the sum of its proper divisors (217204655523).

621543729693 is a wasteful number, since it uses less digits than its factorization.

621543729693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115484.

The product of its digits is 14696640, while the sum is 57.

The spelling of 621543729693 in words is "six hundred twenty-one billion, five hundred forty-three million, seven hundred twenty-nine thousand, six hundred ninety-three".