125821130477 has 6 divisors (see below), whose sum is σ = 146363355918. Its totient is φ = 107846683224.

The previous prime is 125821130437. The next prime is 125821130503. The reversal of 125821130477 is 774031128521.

It can be written as a sum of positive squares in only one way, i.e., 111596751721 + 14224378756 = 334061^2 + 119266^2 .

It is not a de Polignac number, because 125821130477 - 2²⁰ = 125820081901 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 (125821130437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1283889038 + ... + 1283889135.

It is an arithmetic number, because the mean of its divisors is an integer number (24393892653).

Almost surely, 2^125821130477 is an apocalyptic number.

It is an amenable number.

125821130477 is a deficient number, since it is larger than the sum of its proper divisors (20542225441).

125821130477 is an equidigital number, since it uses as much as digits as its factorization.

125821130477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2567778187 (or 2567778180 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 41.

Adding to 125821130477 its reverse (774031128521), we get a palindrome (899852258998).

The spelling of 125821130477 in words is "one hundred twenty-five billion, eight hundred twenty-one million, one hundred thirty thousand, four hundred seventy-seven".