125319720081 has 16 divisors (see below), whose sum is σ = 170668341504. Its totient is φ = 81759210624.

The previous prime is 125319720077. The next prime is 125319720083. The reversal of 125319720081 is 180027913521.

It is a happy number.

It is not a de Polignac number, because 125319720081 - 2² = 125319720077 is a prime.

It is a super-2 number, since 2×125319720081² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125319720083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1257231 + ... + 1353243.

It is an arithmetic number, because the mean of its divisors is an integer number (10666771344).

Almost surely, 2^125319720081 is an apocalyptic number.

It is an amenable number.

125319720081 is a deficient number, since it is larger than the sum of its proper divisors (45348621423).

125319720081 is an equidigital number, since it uses as much as digits as its factorization.

125319720081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105320.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 125319720081 in words is "one hundred twenty-five billion, three hundred nineteen million, seven hundred twenty thousand, eighty-one".