166683551837 has 4 divisors (see below), whose sum is σ = 181836602016. Its totient is φ = 151530501660.

The previous prime is 166683551819. The next prime is 166683551843. The reversal of 166683551837 is 738155386661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166683551837 - 2¹⁶ = 166683486301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166683551537) 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, 7576525073 + ... + 7576525094.

It is an arithmetic number, because the mean of its divisors is an integer number (45459150504).

Almost surely, 2^166683551837 is an apocalyptic number.

It is an amenable number.

166683551837 is a deficient number, since it is larger than the sum of its proper divisors (15153050179).

166683551837 is a wasteful number, since it uses less digits than its factorization.

166683551837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15153050178.

The product of its digits is 21772800, while the sum is 59.

The spelling of 166683551837 in words is "one hundred sixty-six billion, six hundred eighty-three million, five hundred fifty-one thousand, eight hundred thirty-seven".