61173402725 has 12 divisors (see below), whose sum is σ = 79847389440. Its totient is φ = 46362999600.

The previous prime is 61173402721. The next prime is 61173402737. The reversal of 61173402725 is 52720437116.

It is not a de Polignac number, because 61173402725 - 2² = 61173402721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61173402721) 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 11 ways as a sum of consecutive naturals, for example, 64392581 + ... + 64393530.

It is an arithmetic number, because the mean of its divisors is an integer number (6653949120).

Almost surely, 2^61173402725 is an apocalyptic number.

It is an amenable number.

61173402725 is a deficient number, since it is larger than the sum of its proper divisors (18673986715).

61173402725 is a wasteful number, since it uses less digits than its factorization.

61173402725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128786140 (or 128786135 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 61173402725 in words is "sixty-one billion, one hundred seventy-three million, four hundred two thousand, seven hundred twenty-five".