161770377000 has 128 divisors (see below), whose sum is σ = 508067539200. Its totient is φ = 42852960000.

The previous prime is 161770376981. The next prime is 161770377007. The reversal of 161770377000 is 773077161.

It is a self number, because there is not a number n which added to its sum of digits gives 161770377000.

It is not an unprimeable number, because it can be changed into a prime (161770377007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274446 + ... + 631554.

It is an arithmetic number, because the mean of its divisors is an integer number (3969277650).

Almost surely, 2^161770377000 is an apocalyptic number.

161770377000 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 161770377000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254033769600).

161770377000 is an abundant number, since it is smaller than the sum of its proper divisors (346297162200).

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

161770377000 is a wasteful number, since it uses less digits than its factorization.

161770377000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357284 (or 357270 counting only the distinct ones).

The product of its (nonzero) digits is 43218, while the sum is 39.

The spelling of 161770377000 in words is "one hundred sixty-one billion, seven hundred seventy million, three hundred seventy-seven thousand".