125216081693 has 4 divisors (see below), whose sum is σ = 128270132508. Its totient is φ = 122162030880.

The previous prime is 125216081681. The next prime is 125216081707. The reversal of 125216081693 is 396180612521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 396180612521 = 17 ⋅23304741913.

It can be written as a sum of positive squares in 2 ways, for example, as 5916994084 + 119299087609 = 76922^2 + 345397^2 .

It is a cyclic number.

It is not a de Polignac number, because 125216081693 - 2¹⁰ = 125216080669 is a prime.

It is a super-2 number, since 2×125216081693² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125216081623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1527025346 + ... + 1527025427.

It is an arithmetic number, because the mean of its divisors is an integer number (32067533127).

Almost surely, 2^125216081693 is an apocalyptic number.

It is an amenable number.

125216081693 is a deficient number, since it is larger than the sum of its proper divisors (3054050815).

125216081693 is an equidigital number, since it uses as much as digits as its factorization.

125216081693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3054050814.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 125216081693 in words is "one hundred twenty-five billion, two hundred sixteen million, eighty-one thousand, six hundred ninety-three".