172020550640 has 40 divisors (see below), whose sum is σ = 423474123600. Its totient is φ = 64760677376.

The previous prime is 172020550633. The next prime is 172020550661. The reversal of 172020550640 is 46055020271.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 172020550597 and 172020550606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63241490 + ... + 63244209.

It is an arithmetic number, because the mean of its divisors is an integer number (10586853090).

Almost surely, 2^172020550640 is an apocalyptic number.

172020550640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172020550640 is an abundant number, since it is smaller than the sum of its proper divisors (251453572960).

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

172020550640 is a wasteful number, since it uses less digits than its factorization.

172020550640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126485729 (or 126485723 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 172020550640 in words is "one hundred seventy-two billion, twenty million, five hundred fifty thousand, six hundred forty".