61671324545 has 8 divisors (see below), whose sum is σ = 75019365096. Its totient is φ = 48661209216.

The previous prime is 61671324529. The next prime is 61671324557. The reversal of 61671324545 is 54542317616.

It can be written as a sum of positive squares in 4 ways, for example, as 14561490241 + 47109834304 = 120671^2 + 217048^2 .

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 61671324545 - 2⁴ = 61671324529 is a prime.

It is a super-2 number, since 2×61671324545² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61671324496 and 61671324505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84480902 + ... + 84481631.

It is an arithmetic number, because the mean of its divisors is an integer number (9377420637).

Almost surely, 2^61671324545 is an apocalyptic number.

It is an amenable number.

61671324545 is a deficient number, since it is larger than the sum of its proper divisors (13348040551).

61671324545 is a wasteful number, since it uses less digits than its factorization.

61671324545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168962611.

The product of its digits is 604800, while the sum is 44.

The spelling of 61671324545 in words is "sixty-one billion, six hundred seventy-one million, three hundred twenty-four thousand, five hundred forty-five".