161745948757 has 4 divisors (see below), whose sum is σ = 161877343936. Its totient is φ = 161614553580.

The previous prime is 161745948743. The next prime is 161745948827. The reversal of 161745948757 is 757849547161.

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 161745948757 - 2¹⁹ = 161745424469 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 (161745943757) 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, 65695743 + ... + 65698204.

It is an arithmetic number, because the mean of its divisors is an integer number (40469335984).

Almost surely, 2^161745948757 is an apocalyptic number.

It is an amenable number.

161745948757 is a deficient number, since it is larger than the sum of its proper divisors (131395179).

161745948757 is a wasteful number, since it uses less digits than its factorization.

161745948757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131395178.

The product of its digits is 59270400, while the sum is 64.

The spelling of 161745948757 in words is "one hundred sixty-one billion, seven hundred forty-five million, nine hundred forty-eight thousand, seven hundred fifty-seven".