161703120400 has 120 divisors (see below), whose sum is σ = 390190970624. Its totient is φ = 64399104000.

The previous prime is 161703120379. The next prime is 161703120407. The reversal of 161703120400 is 4021307161.

It is a super-2 number, since 2×161703120400² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (161703120407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134639800 + ... + 134641000.

Almost surely, 2^161703120400 is an apocalyptic number.

161703120400 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 161703120400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195095485312).

161703120400 is an abundant number, since it is smaller than the sum of its proper divisors (228487850224).

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

161703120400 is a wasteful number, since it uses less digits than its factorization.

161703120400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409 (or 2398 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 161703120400 its reverse (4021307161), we get a palindrome (165724427561).

The spelling of 161703120400 in words is "one hundred sixty-one billion, seven hundred three million, one hundred twenty thousand, four hundred".