168221320769940 has 96 divisors (see below), whose sum is σ = 472713152034816. Its totient is φ = 44697793198080.

The previous prime is 168221320769899. The next prime is 168221320769963. The reversal of 168221320769940 is 49967023122861.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96192589 + ... + 97925771.

It is an arithmetic number, because the mean of its divisors is an integer number (4924095333696).

Almost surely, 2^{168221320769940} is an apocalyptic number.

168221320769940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168221320769940 is an abundant number, since it is smaller than the sum of its proper divisors (304491831264876).

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

168221320769940 is a wasteful number, since it uses less digits than its factorization.

168221320769940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739009 (or 1739007 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 60.

The spelling of 168221320769940 in words is "one hundred sixty-eight trillion, two hundred twenty-one billion, three hundred twenty million, seven hundred sixty-nine thousand, nine hundred forty".