61731125661 has 8 divisors (see below), whose sum is σ = 82309849920. Its totient is φ = 41153242592.

The previous prime is 61731125627. The next prime is 61731125669. The reversal of 61731125661 is 16652113716.

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

It is a cyclic number.

It is not a de Polignac number, because 61731125661 - 2¹⁴ = 61731109277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61731125669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12480 + ... + 351593.

It is an arithmetic number, because the mean of its divisors is an integer number (10288731240).

Almost surely, 2^61731125661 is an apocalyptic number.

It is an amenable number.

61731125661 is a deficient number, since it is larger than the sum of its proper divisors (20578724259).

61731125661 is a wasteful number, since it uses less digits than its factorization.

61731125661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420595.

The product of its digits is 45360, while the sum is 39.

The spelling of 61731125661 in words is "sixty-one billion, seven hundred thirty-one million, one hundred twenty-five thousand, six hundred sixty-one".