125918685901 has 4 divisors (see below), whose sum is σ = 128989873404. Its totient is φ = 122847498400.

The previous prime is 125918685889. The next prime is 125918685911. The reversal of 125918685901 is 109586819521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14446838025 + 111471847876 = 120195^2 + 333874^2 .

It is a cyclic number.

It is not a de Polignac number, because 125918685901 - 2¹⁷ = 125918554829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125918685911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535593690 + ... + 1535593771.

It is an arithmetic number, because the mean of its divisors is an integer number (32247468351).

Almost surely, 2^125918685901 is an apocalyptic number.

It is an amenable number.

125918685901 is a deficient number, since it is larger than the sum of its proper divisors (3071187503).

125918685901 is an equidigital number, since it uses as much as digits as its factorization.

125918685901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071187502.

The product of its (nonzero) digits is 1555200, while the sum is 55.

The spelling of 125918685901 in words is "one hundred twenty-five billion, nine hundred eighteen million, six hundred eighty-five thousand, nine hundred one".