161722477500 has 240 divisors, whose sum is σ = 482079185280. Its totient is φ = 42167840000.

The previous prime is 161722477489. The next prime is 161722477529. The reversal of 161722477500 is 5774227161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 166552015 + ... + 166552985.

It is an arithmetic number, because the mean of its divisors is an integer number (2008663272).

Almost surely, 2^161722477500 is an apocalyptic number.

161722477500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161722477500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241039592640).

161722477500 is an abundant number, since it is smaller than the sum of its proper divisors (320356707780).

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

161722477500 is a wasteful number, since it uses less digits than its factorization.

161722477500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470 (or 1453 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The spelling of 161722477500 in words is "one hundred sixty-one billion, seven hundred twenty-two million, four hundred seventy-seven thousand, five hundred".