165649950961 has 4 divisors (see below), whose sum is σ = 180709037424. Its totient is φ = 150590864500.

The previous prime is 165649950959. The next prime is 165649951007. The reversal of 165649950961 is 169059946561.

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 165649950961 - 2¹ = 165649950959 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 165649950961.

It is not an unprimeable number, because it can be changed into a prime (165649950061) 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, 7529543215 + ... + 7529543236.

It is an arithmetic number, because the mean of its divisors is an integer number (45177259356).

Almost surely, 2^165649950961 is an apocalyptic number.

165649950961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165649950961 is a deficient number, since it is larger than the sum of its proper divisors (15059086463).

165649950961 is a wasteful number, since it uses less digits than its factorization.

165649950961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15059086462.

The product of its (nonzero) digits is 15746400, while the sum is 61.

The spelling of 165649950961 in words is "one hundred sixty-five billion, six hundred forty-nine million, nine hundred fifty thousand, nine hundred sixty-one".