168511778340 has 48 divisors (see below), whose sum is σ = 473500281408. Its totient is φ = 44777683584.

The previous prime is 168511778317. The next prime is 168511778387. The reversal of 168511778340 is 43877115861.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4945087 + ... + 4979046.

It is an arithmetic number, because the mean of its divisors is an integer number (9864589196).

Almost surely, 2^168511778340 is an apocalyptic number.

168511778340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168511778340 is an abundant number, since it is smaller than the sum of its proper divisors (304988503068).

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

168511778340 is a wasteful number, since it uses less digits than its factorization.

168511778340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9924428 (or 9924426 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 168511778340 in words is "one hundred sixty-eight billion, five hundred eleven million, seven hundred seventy-eight thousand, three hundred forty".