61172401725 has 36 divisors (see below), whose sum is σ = 109646922996. Its totient is φ = 32601354240.

The previous prime is 61172401663. The next prime is 61172401781. The reversal of 61172401725 is 52710427116.

61172401725 is a `hidden beast` number, since 61 + 172 + 401 + 7 + 25 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 8762083236 + 52410318489 = 93606^2 + 228933^2 .

It is not a de Polignac number, because 61172401725 - 2²² = 61168207421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61172401725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 209917 + ... + 407933.

It is an arithmetic number, because the mean of its divisors is an integer number (3045747861).

Almost surely, 2^61172401725 is an apocalyptic number.

It is an amenable number.

61172401725 is a deficient number, since it is larger than the sum of its proper divisors (48474521271).

61172401725 is a wasteful number, since it uses less digits than its factorization.

61172401725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199406 (or 199398 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 61172401725 in words is "sixty-one billion, one hundred seventy-two million, four hundred one thousand, seven hundred twenty-five".