67620505661666 has 16 divisors (see below), whose sum is σ = 102048131607840. Its totient is φ = 33604649647680.

The previous prime is 67620505661633. The next prime is 67620505661701. The reversal of 67620505661666 is 66616650502676.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 67620505661599 and 67620505661608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46242791 + ... + 47682666.

It is an arithmetic number, because the mean of its divisors is an integer number (6378008225490).

Almost surely, 2^{67620505661666} is an apocalyptic number.

67620505661666 is a deficient number, since it is larger than the sum of its proper divisors (34427625946174).

67620505661666 is a wasteful number, since it uses less digits than its factorization.

67620505661666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93927649.

The product of its (nonzero) digits is 97977600, while the sum is 62.

The spelling of 67620505661666 in words is "sixty-seven trillion, six hundred twenty billion, five hundred five million, six hundred sixty-one thousand, six hundred sixty-six".