166390136233 has 8 divisors (see below), whose sum is σ = 170948282760. Its totient is φ = 161835206400.

The previous prime is 166390136197. The next prime is 166390136239. The reversal of 166390136233 is 332631093661.

It can be written as a sum of positive squares in 4 ways, for example, as 77402473369 + 88987662864 = 278213^2 + 298308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166390136233 - 2³³ = 157800201641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166390136233.

It is not an unprimeable number, because it can be changed into a prime (166390136239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699118 + ... + 906391.

It is an arithmetic number, because the mean of its divisors is an integer number (21368535345).

Almost surely, 2^166390136233 is an apocalyptic number.

It is an amenable number.

166390136233 is a deficient number, since it is larger than the sum of its proper divisors (4558146527).

166390136233 is a wasteful number, since it uses less digits than its factorization.

166390136233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608347.

The product of its (nonzero) digits is 314928, while the sum is 43.

The spelling of 166390136233 in words is "one hundred sixty-six billion, three hundred ninety million, one hundred thirty-six thousand, two hundred thirty-three".