168156422640 has 240 divisors, whose sum is σ = 582422151168. Its totient is φ = 43452993024.

The previous prime is 168156422633. The next prime is 168156422689. The reversal of 168156422640 is 46224651861.

It is a happy number.

168156422640 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 564 + 22 + 64 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3910537 + ... + 3953303.

Almost surely, 2^168156422640 is an apocalyptic number.

168156422640 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 168156422640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291211075584).

168156422640 is an abundant number, since it is smaller than the sum of its proper divisors (414265728528).

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

168156422640 is a wasteful number, since it uses less digits than its factorization.

168156422640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42956 (or 42947 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 168156422640 in words is "one hundred sixty-eight billion, one hundred fifty-six million, four hundred twenty-two thousand, six hundred forty".