125518991497 has 8 divisors (see below), whose sum is σ = 128654357832. Its totient is φ = 122387145600.

The previous prime is 125518991491. The next prime is 125518991503. The reversal of 125518991497 is 794199815521.

It is an interprime number because it is at equal distance from previous prime (125518991491) and next prime (125518991503).

It can be written as a sum of positive squares in 4 ways, for example, as 15912308736 + 109606682761 = 126144^2 + 331069^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125518991497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125518991491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807838 + ... + 950599.

It is an arithmetic number, because the mean of its divisors is an integer number (16081794729).

Almost surely, 2^125518991497 is an apocalyptic number.

It is an amenable number.

125518991497 is a deficient number, since it is larger than the sum of its proper divisors (3135366335).

125518991497 is a wasteful number, since it uses less digits than its factorization.

125518991497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760219.

The product of its digits is 8164800, while the sum is 61.

The spelling of 125518991497 in words is "one hundred twenty-five billion, five hundred eighteen million, nine hundred ninety-one thousand, four hundred ninety-seven".