161335781750 has 128 divisors (see below), whose sum is σ = 355778002944. Its totient is φ = 54008688000.

The previous prime is 161335781681. The next prime is 161335781759. The reversal of 161335781750 is 57187533161.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 161335781695 and 161335781704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161335781759) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13686359 + ... + 13698141.

It is an arithmetic number, because the mean of its divisors is an integer number (2779515648).

Almost surely, 2^161335781750 is an apocalyptic number.

161335781750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161335781750 is an abundant number, since it is smaller than the sum of its proper divisors (194442221194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161335781750 is a wasteful number, since it uses less digits than its factorization.

161335781750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12207 (or 12197 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 161335781750 in words is "one hundred sixty-one billion, three hundred thirty-five million, seven hundred eighty-one thousand, seven hundred fifty".