161205280112749 has 4 divisors (see below), whose sum is σ = 164635179689664. Its totient is φ = 157775380535836.

The previous prime is 161205280112659. The next prime is 161205280112777. The reversal of 161205280112749 is 947211082502161.

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 161205280112749 - 2⁹ = 161205280112237 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 (161205280115749) 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, 1714949788387 + ... + 1714949788480.

It is an arithmetic number, because the mean of its divisors is an integer number (41158794922416).

Almost surely, 2^{161205280112749} is an apocalyptic number.

It is an amenable number.

161205280112749 is a deficient number, since it is larger than the sum of its proper divisors (3429899576915).

161205280112749 is an equidigital number, since it uses as much as digits as its factorization.

161205280112749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429899576914.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 161205280112749 in words is "one hundred sixty-one trillion, two hundred five billion, two hundred eighty million, one hundred twelve thousand, seven hundred forty-nine".