125781318819 has 48 divisors (see below), whose sum is σ = 209305317312. Its totient is φ = 72099569664.

The previous prime is 125781318779. The next prime is 125781318821. The reversal of 125781318819 is 918813187521.

It is not a de Polignac number, because 125781318819 - 2²⁰ = 125780270243 is a prime.

It is a super-2 number, since 2×125781318819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125781316819) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133039 + ... + 518904.

It is an arithmetic number, because the mean of its divisors is an integer number (4360527444).

Almost surely, 2^125781318819 is an apocalyptic number.

125781318819 is a deficient number, since it is larger than the sum of its proper divisors (83523998493).

125781318819 is a wasteful number, since it uses less digits than its factorization.

125781318819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652076 (or 652073 counting only the distinct ones).

The product of its digits is 967680, while the sum is 54.

The spelling of 125781318819 in words is "one hundred twenty-five billion, seven hundred eighty-one million, three hundred eighteen thousand, eight hundred nineteen".