165821650149 has 32 divisors (see below), whose sum is σ = 243173191680. Its totient is φ = 100043076672.

The previous prime is 165821650133. The next prime is 165821650151. The reversal of 165821650149 is 941056128561.

It is not a de Polignac number, because 165821650149 - 2⁴ = 165821650133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165821650098 and 165821650107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165821650649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 908884 + ... + 1075970.

It is an arithmetic number, because the mean of its divisors is an integer number (7599162240).

Almost surely, 2^165821650149 is an apocalyptic number.

165821650149 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

165821650149 is a deficient number, since it is larger than the sum of its proper divisors (77351541531).

165821650149 is a wasteful number, since it uses less digits than its factorization.

165821650149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167889.

The product of its (nonzero) digits is 518400, while the sum is 48.

The spelling of 165821650149 in words is "one hundred sixty-five billion, eight hundred twenty-one million, six hundred fifty thousand, one hundred forty-nine".