166611650516 has 6 divisors (see below), whose sum is σ = 291570388410. Its totient is φ = 83305825256.

The previous prime is 166611650459. The next prime is 166611650537. The reversal of 166611650516 is 615056116661.

It can be written as a sum of positive squares in only one way, i.e., 145164048016 + 21447602500 = 381004^2 + 146450^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20826456311 + ... + 20826456318.

It is an arithmetic number, because the mean of its divisors is an integer number (48595064735).

Almost surely, 2^166611650516 is an apocalyptic number.

It is an amenable number.

166611650516 is a deficient number, since it is larger than the sum of its proper divisors (124958737894).

166611650516 is a wasteful number, since it uses less digits than its factorization.

166611650516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41652912633 (or 41652912631 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 166611650516 in words is "one hundred sixty-six billion, six hundred eleven million, six hundred fifty thousand, five hundred sixteen".