61155229825 has 12 divisors (see below), whose sum is σ = 76583304828. Its totient is φ = 48439784000.

The previous prime is 61155229799. The next prime is 61155229829. The reversal of 61155229825 is 52892255116.

It can be written as a sum of positive squares in 6 ways, for example, as 493017616 + 60662212209 = 22204^2 + 246297^2 .

It is not a de Polignac number, because 61155229825 - 2⁷ = 61155229697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61155229829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12107422 + ... + 12112471.

It is an arithmetic number, because the mean of its divisors is an integer number (6381942069).

Almost surely, 2^61155229825 is an apocalyptic number.

It is an amenable number.

61155229825 is a deficient number, since it is larger than the sum of its proper divisors (15428075003).

61155229825 is a wasteful number, since it uses less digits than its factorization.

61155229825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24220004 (or 24219999 counting only the distinct ones).

The product of its digits is 432000, while the sum is 46.

The spelling of 61155229825 in words is "sixty-one billion, one hundred fifty-five million, two hundred twenty-nine thousand, eight hundred twenty-five".