161401134225 has 24 divisors (see below), whose sum is σ = 266957913600. Its totient is φ = 86045753920.

The previous prime is 161401134217. The next prime is 161401134233. The reversal of 161401134225 is 522431104161.

It is an interprime number because it is at equal distance from previous prime (161401134217) and next prime (161401134233).

It is not a de Polignac number, because 161401134225 - 2³ = 161401134217 is a prime.

It is a super-2 number, since 2×161401134225² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161401134192 and 161401134201.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248625 + ... + 620174.

It is an arithmetic number, because the mean of its divisors is an integer number (11123246400).

Almost surely, 2^161401134225 is an apocalyptic number.

161401134225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161401134225 is a deficient number, since it is larger than the sum of its proper divisors (105556779375).

161401134225 is a wasteful number, since it uses less digits than its factorization.

161401134225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871289 (or 871284 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 161401134225 its reverse (522431104161), we get a palindrome (683832238386).

The spelling of 161401134225 in words is "one hundred sixty-one billion, four hundred one million, one hundred thirty-four thousand, two hundred twenty-five".