125995599521 has 8 divisors (see below), whose sum is σ = 137454120288. Its totient is φ = 114537808000.

The previous prime is 125995599451. The next prime is 125995599557.

125995599521 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 125995599521 - 2³⁴ = 108815730337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125995599571) 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, 216986 + ... + 546876.

It is an arithmetic number, because the mean of its divisors is an integer number (17181765036).

Almost surely, 2^125995599521 is an apocalyptic number.

125995599521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125995599521 is a deficient number, since it is larger than the sum of its proper divisors (11458520767).

125995599521 is a wasteful number, since it uses less digits than its factorization.

125995599521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364623.

The product of its digits is 16402500, while the sum is 62.

The spelling of 125995599521 in words is "one hundred twenty-five billion, nine hundred ninety-five million, five hundred ninety-nine thousand, five hundred twenty-one".