67655505621 has 16 divisors (see below), whose sum is σ = 100501797888. Its totient is φ = 40130924400.

The previous prime is 67655505613. The next prime is 67655505647. The reversal of 67655505621 is 12650555676.

It is a happy number.

67655505621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 67655505621 - 2³ = 67655505613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67655505611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21808735 + ... + 21811836.

It is an arithmetic number, because the mean of its divisors is an integer number (6281362368).

Almost surely, 2^67655505621 is an apocalyptic number.

It is an amenable number.

67655505621 is a deficient number, since it is larger than the sum of its proper divisors (32846292267).

67655505621 is a wasteful number, since it uses less digits than its factorization.

67655505621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43620632.

The product of its (nonzero) digits is 1890000, while the sum is 48.

The spelling of 67655505621 in words is "sixty-seven billion, six hundred fifty-five million, five hundred five thousand, six hundred twenty-one".