161783265381 has 8 divisors (see below), whose sum is σ = 223149331680. Its totient is φ = 104136354672.

The previous prime is 161783265359. The next prime is 161783265383. The reversal of 161783265381 is 183562387161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161783265381 - 2¹³ = 161783257189 is a prime.

It is a super-2 number, since 2×161783265381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161783265383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929788795 + ... + 929788968.

It is an arithmetic number, because the mean of its divisors is an integer number (27893666460).

Almost surely, 2^161783265381 is an apocalyptic number.

It is an amenable number.

161783265381 is a deficient number, since it is larger than the sum of its proper divisors (61366066299).

161783265381 is a wasteful number, since it uses less digits than its factorization.

161783265381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859577795.

The product of its digits is 1451520, while the sum is 51.

The spelling of 161783265381 in words is "one hundred sixty-one billion, seven hundred eighty-three million, two hundred sixty-five thousand, three hundred eighty-one".