125661474777 has 8 divisors (see below), whose sum is σ = 167550376864. Its totient is φ = 83773444608.

The previous prime is 125661474767. The next prime is 125661474781. The reversal of 125661474777 is 777474166521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125661474777 - 2¹⁰ = 125661473753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125661474727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282393 + ... + 575385.

It is an arithmetic number, because the mean of its divisors is an integer number (20943797108).

Almost surely, 2^125661474777 is an apocalyptic number.

It is an amenable number.

125661474777 is a deficient number, since it is larger than the sum of its proper divisors (41888902087).

125661474777 is a wasteful number, since it uses less digits than its factorization.

125661474777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435959.

The product of its digits is 13829760, while the sum is 57.

The spelling of 125661474777 in words is "one hundred twenty-five billion, six hundred sixty-one million, four hundred seventy-four thousand, seven hundred seventy-seven".