125728194816 has 180 divisors, whose sum is σ = 428456183232. Its totient is φ = 35922299904.

The previous prime is 125728194799. The next prime is 125728194821. The reversal of 125728194816 is 618491827521.

125728194816 is a `hidden beast` number, since 1 + 2 + 572 + 8 + 19 + 48 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 287940 + ... + 578243.

Almost surely, 2^125728194816 is an apocalyptic number.

125728194816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

125728194816 is an abundant number, since it is smaller than the sum of its proper divisors (302727988416).

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

125728194816 is an frugal number, since it uses more digits than its factorization.

125728194816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866218 (or 866195 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 125728194816 in words is "one hundred twenty-five billion, seven hundred twenty-eight million, one hundred ninety-four thousand, eight hundred sixteen".