19857689401980 has 24 divisors (see below), whose sum is σ = 55601530325712. Its totient is φ = 5295383840512.

The previous prime is 19857689401943. The next prime is 19857689401999. The reversal of 19857689401980 is 8910498675891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165480744957 + ... + 165480745076.

It is an arithmetic number, because the mean of its divisors is an integer number (2316730430238).

Almost surely, 2^{19857689401980} is an apocalyptic number.

19857689401980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19857689401980 is an abundant number, since it is smaller than the sum of its proper divisors (35743840923732).

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

19857689401980 is a wasteful number, since it uses less digits than its factorization.

19857689401980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330961490045 (or 330961490043 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 75.

The spelling of 19857689401980 in words is "nineteen trillion, eight hundred fifty-seven billion, six hundred eighty-nine million, four hundred one thousand, nine hundred eighty".