125201777777 has 4 divisors (see below), whose sum is σ = 128255479716. Its totient is φ = 122148075840.

The previous prime is 125201777773. The next prime is 125201777783. The reversal of 125201777777 is 777777102521.

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 71700237361 + 53501540416 = 267769^2 + 231304^2 .

It is a cyclic number.

It is not a de Polignac number, because 125201777777 - 2² = 125201777773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125201777773) 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, 1526850908 + ... + 1526850989.

It is an arithmetic number, because the mean of its divisors is an integer number (32063869929).

Almost surely, 2^125201777777 is an apocalyptic number.

It is an amenable number.

125201777777 is a deficient number, since it is larger than the sum of its proper divisors (3053701939).

125201777777 is an equidigital number, since it uses as much as digits as its factorization.

125201777777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053701938.

The product of its (nonzero) digits is 2352980, while the sum is 53.

The spelling of 125201777777 in words is "one hundred twenty-five billion, two hundred one million, seven hundred seventy-seven thousand, seven hundred seventy-seven".