125129979819 has 32 divisors (see below), whose sum is σ = 201575861760. Its totient is φ = 76255439904.

The previous prime is 125129979787. The next prime is 125129979823. The reversal of 125129979819 is 918979921521.

125129979819 is a `hidden beast` number, since 1 + 251 + 299 + 7 + 98 + 1 + 9 = 666.

It is not a de Polignac number, because 125129979819 - 2⁵ = 125129979787 is a prime.

It is a super-2 number, since 2×125129979819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125129979899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1694409 + ... + 1766714.

It is an arithmetic number, because the mean of its divisors is an integer number (6299245680).

Almost surely, 2^125129979819 is an apocalyptic number.

125129979819 is a deficient number, since it is larger than the sum of its proper divisors (76445881941).

125129979819 is a wasteful number, since it uses less digits than its factorization.

125129979819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461248 (or 3461242 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 63.

The spelling of 125129979819 in words is "one hundred twenty-five billion, one hundred twenty-nine million, nine hundred seventy-nine thousand, eight hundred nineteen".