161701489684 has 24 divisors (see below), whose sum is σ = 332143602560. Its totient is φ = 67427647776.

The previous prime is 161701489619. The next prime is 161701489709. The reversal of 161701489684 is 486984107161.

It is a happy number.

It is a super-2 number, since 2×161701489684² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78040224 + ... + 78042295.

Almost surely, 2^161701489684 is an apocalyptic number.

161701489684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161701489684 is an abundant number, since it is smaller than the sum of its proper divisors (170442112876).

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

161701489684 is a wasteful number, since it uses less digits than its factorization.

161701489684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156082567 (or 156082565 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 55.

The spelling of 161701489684 in words is "one hundred sixty-one billion, seven hundred one million, four hundred eighty-nine thousand, six hundred eighty-four".