161147769780 has 48 divisors (see below), whose sum is σ = 451245078144. Its totient is φ = 42969755520.

The previous prime is 161147769767. The next prime is 161147769787. The reversal of 161147769780 is 87967741161.

It is a happy number.

161147769780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161147769780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161147769787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858625 + ... + 1029335.

It is an arithmetic number, because the mean of its divisors is an integer number (9400939128).

Almost surely, 2^161147769780 is an apocalyptic number.

161147769780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161147769780 is an abundant number, since it is smaller than the sum of its proper divisors (290097308364).

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

161147769780 is a wasteful number, since it uses less digits than its factorization.

161147769780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186456 (or 186454 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 57.

The spelling of 161147769780 in words is "one hundred sixty-one billion, one hundred forty-seven million, seven hundred sixty-nine thousand, seven hundred eighty".