61172525512561 has 8 divisors (see below), whose sum is σ = 62350100825544. Its totient is φ = 60006112051200.

The previous prime is 61172525512541. The next prime is 61172525512589. The reversal of 61172525512561 is 16521552527116.

It can be written as a sum of positive squares in 4 ways, for example, as 4207240936336 + 56965284576225 = 2051156^2 + 7547535^2 .

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 61172525512561 - 2²⁵ = 61172491958129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61172525512541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2790451840 + ... + 2790473761.

It is an arithmetic number, because the mean of its divisors is an integer number (7793762603193).

Almost surely, 2^{61172525512561} is an apocalyptic number.

It is an amenable number.

61172525512561 is a deficient number, since it is larger than the sum of its proper divisors (1177575312983).

61172525512561 is a wasteful number, since it uses less digits than its factorization.

61172525512561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580925811.

The product of its digits is 1260000, while the sum is 49.

The spelling of 61172525512561 in words is "sixty-one trillion, one hundred seventy-two billion, five hundred twenty-five million, five hundred twelve thousand, five hundred sixty-one".