61725557106 has 12 divisors (see below), whose sum is σ = 133738707102. Its totient is φ = 20575185696.

The previous prime is 61725557087. The next prime is 61725557111. The reversal of 61725557106 is 60175552716.

61725557106 is a `hidden beast` number, since 6 + 1 + 72 + 5 + 5 + 571 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61632531081 + 93026025 = 248259^2 + 9645^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1714598791 + ... + 1714598826.

Almost surely, 2^61725557106 is an apocalyptic number.

61725557106 is an abundant number, since it is smaller than the sum of its proper divisors (72013149996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61725557106 is a wasteful number, since it uses less digits than its factorization.

61725557106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3429197625 (or 3429197622 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 45.

The spelling of 61725557106 in words is "sixty-one billion, seven hundred twenty-five million, five hundred fifty-seven thousand, one hundred six".