19857432780045 has 384 divisors, whose sum is σ = 43754217062400. Its totient is φ = 8495457417216.

The previous prime is 19857432780037. The next prime is 19857432780067. The reversal of 19857432780045 is 54008723475891.

19857432780045 is a `hidden beast` number, since 1 + 9 + 85 + 7 + 432 + 7 + 80 + 0 + 45 = 666.

It is not a de Polignac number, because 19857432780045 - 2³ = 19857432780037 is a prime.

It is a super-2 number, since 2×19857432780045² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 5993790309 + ... + 5993793621.

It is an arithmetic number, because the mean of its divisors is an integer number (113943273600).

Almost surely, 2^{19857432780045} is an apocalyptic number.

19857432780045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19857432780045 is an abundant number, since it is smaller than the sum of its proper divisors (23896784282355).

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

19857432780045 is a wasteful number, since it uses less digits than its factorization.

19857432780045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926 (or 3913 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 63.

The spelling of 19857432780045 in words is "nineteen trillion, eight hundred fifty-seven billion, four hundred thirty-two million, seven hundred eighty thousand, forty-five".