125777540101 has 4 divisors (see below), whose sum is σ = 126091200204. Its totient is φ = 125463880000.

The previous prime is 125777540099. The next prime is 125777540111. The reversal of 125777540101 is 101045777521.

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 117971640900 + 7805899201 = 343470^2 + 88351^2 .

It is a cyclic number.

It is not a de Polignac number, because 125777540101 - 2¹ = 125777540099 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125777540111) 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, 156829450 + ... + 156830251.

It is an arithmetic number, because the mean of its divisors is an integer number (31522800051).

Almost surely, 2^125777540101 is an apocalyptic number.

It is an amenable number.

125777540101 is a deficient number, since it is larger than the sum of its proper divisors (313660103).

125777540101 is an equidigital number, since it uses as much as digits as its factorization.

125777540101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313660102.

The product of its (nonzero) digits is 68600, while the sum is 40.

The spelling of 125777540101 in words is "one hundred twenty-five billion, seven hundred seventy-seven million, five hundred forty thousand, one hundred one".