166620069772 has 24 divisors (see below), whose sum is σ = 314056329552. Its totient is φ = 76891387200.

The previous prime is 166620069769. The next prime is 166620069787. The reversal of 166620069772 is 277960026661.

It is a super-2 number, since 2×166620069772² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 191622 + ... + 608242.

It is an arithmetic number, because the mean of its divisors is an integer number (13085680398).

Almost surely, 2^166620069772 is an apocalyptic number.

It is an amenable number.

166620069772 is a deficient number, since it is larger than the sum of its proper divisors (147436259780).

166620069772 is a wasteful number, since it uses less digits than its factorization.

166620069772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424329 (or 424327 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 52.

The spelling of 166620069772 in words is "one hundred sixty-six billion, six hundred twenty million, sixty-nine thousand, seven hundred seventy-two".