166621554364 has 24 divisors (see below), whose sum is σ = 292820790528. Its totient is φ = 82958802480.

The previous prime is 166621554353. The next prime is 166621554373. The reversal of 166621554364 is 463455126661.

It is a congruent number.

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, 2026887 + ... + 2107489.

It is an arithmetic number, because the mean of its divisors is an integer number (12200866272).

Almost surely, 2^166621554364 is an apocalyptic number.

It is an amenable number.

166621554364 is a deficient number, since it is larger than the sum of its proper divisors (126199236164).

166621554364 is a wasteful number, since it uses less digits than its factorization.

166621554364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82785 (or 82783 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 49.

The spelling of 166621554364 in words is "one hundred sixty-six billion, six hundred twenty-one million, five hundred fifty-four thousand, three hundred sixty-four".