164621143880 has 32 divisors (see below), whose sum is σ = 382345885440. Its totient is φ = 63724313280.

The previous prime is 164621143793. The next prime is 164621143909. The reversal of 164621143880 is 88341126461.

It is a super-2 number, since 2×164621143880² (a number of 23 digits) contains 22 as substring.

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, 66378254 + ... + 66380733.

It is an arithmetic number, because the mean of its divisors is an integer number (11948308920).

Almost surely, 2^164621143880 is an apocalyptic number.

164621143880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164621143880 is an abundant number, since it is smaller than the sum of its proper divisors (217724741560).

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

164621143880 is a wasteful number, since it uses less digits than its factorization.

164621143880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132759029 (or 132759025 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 164621143880 in words is "one hundred sixty-four billion, six hundred twenty-one million, one hundred forty-three thousand, eight hundred eighty".