125406919913666 has 16 divisors (see below), whose sum is σ = 188294164709400. Its totient is φ = 62642205818880.

The previous prime is 125406919913657. The next prime is 125406919913707. The reversal of 125406919913666 is 666319919604521.

It can be written as a sum of positive squares in 4 ways, for example, as 124345358550625 + 1061561363041 = 11151025^2 + 1030321^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 125406919913596 and 125406919913605.

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, 31841510 + ... + 35562558.

Almost surely, 2^{125406919913666} is an apocalyptic number.

125406919913666 is a deficient number, since it is larger than the sum of its proper divisors (62887244795734).

125406919913666 is a wasteful number, since it uses less digits than its factorization.

125406919913666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3737509.

The product of its (nonzero) digits is 113374080, while the sum is 68.

The spelling of 125406919913666 in words is "one hundred twenty-five trillion, four hundred six billion, nine hundred nineteen million, nine hundred thirteen thousand, six hundred sixty-six".