161512351000 has 512 divisors, whose sum is σ = 518390046720. Its totient is φ = 45467136000.

The previous prime is 161512350983. The next prime is 161512351001. The reversal of 161512351000 is 153215161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161512351001) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47045284 + ... + 47048716.

It is an arithmetic number, because the mean of its divisors is an integer number (1012480560).

Almost surely, 2^161512351000 is an apocalyptic number.

161512351000 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 161512351000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259195023360).

161512351000 is an abundant number, since it is smaller than the sum of its proper divisors (356877695720).

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

161512351000 is a wasteful number, since it uses less digits than its factorization.

161512351000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532 (or 3518 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 161512351000 its reverse (153215161), we get a palindrome (161665566161).

The spelling of 161512351000 in words is "one hundred sixty-one billion, five hundred twelve million, three hundred fifty-one thousand".