166653565331 has 4 divisors (see below), whose sum is σ = 181803889464. Its totient is φ = 151503241200.

The previous prime is 166653565303. The next prime is 166653565367. The reversal of 166653565331 is 133565356661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166653565331 - 2²⁶ = 166586456467 is a prime.

It is a super-2 number, since 2×166653565331² (a number of 23 digits) contains 22 as substring.

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 166653565331.

It is not an unprimeable number, because it can be changed into a prime (166653565381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7575162050 + ... + 7575162071.

It is an arithmetic number, because the mean of its divisors is an integer number (45450972366).

Almost surely, 2^166653565331 is an apocalyptic number.

166653565331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166653565331 is a deficient number, since it is larger than the sum of its proper divisors (15150324133).

166653565331 is a wasteful number, since it uses less digits than its factorization.

166653565331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15150324132.

The product of its digits is 4374000, while the sum is 50.

The spelling of 166653565331 in words is "one hundred sixty-six billion, six hundred fifty-three million, five hundred sixty-five thousand, three hundred thirty-one".