172666917280 has 384 divisors, whose sum is σ = 500680776960. Its totient is φ = 55419863040.

The previous prime is 172666917277. The next prime is 172666917287. The reversal of 172666917280 is 82719666271.

It is a super-3 number, since 3×172666917280³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (172666917287) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49945312 + ... + 49948768.

It is an arithmetic number, because the mean of its divisors is an integer number (1303856190).

Almost surely, 2^172666917280 is an apocalyptic number.

172666917280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172666917280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250340388480).

172666917280 is an abundant number, since it is smaller than the sum of its proper divisors (328013859680).

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

172666917280 is a wasteful number, since it uses less digits than its factorization.

172666917280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592 (or 3584 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 172666917280 in words is "one hundred seventy-two billion, six hundred sixty-six million, nine hundred seventeen thousand, two hundred eighty".