161310018100 has 72 divisors (see below), whose sum is σ = 436416942528. Its totient is φ = 50278444800.

The previous prime is 161310018071. The next prime is 161310018109. The reversal of 161310018100 is 1810013161.

It is a super-2 number, since 2×161310018100² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161310018109) 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, 10466977 + ... + 10482376.

It is an arithmetic number, because the mean of its divisors is an integer number (6061346424).

Almost surely, 2^161310018100 is an apocalyptic number.

161310018100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161310018100 is an abundant number, since it is smaller than the sum of its proper divisors (275106924428).

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

161310018100 is a wasteful number, since it uses less digits than its factorization.

161310018100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20949385 (or 20949378 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 161310018100 in words is "one hundred sixty-one billion, three hundred ten million, eighteen thousand, one hundred".