61471175509409 has 24 divisors (see below), whose sum is σ = 67356202838760. Its totient is φ = 56024726913792.

The previous prime is 61471175509369. The next prime is 61471175509421. The reversal of 61471175509409 is 90490557117416.

It can be written as a sum of positive squares in 4 ways, for example, as 5021453539600 + 56449721969809 = 2240860^2 + 7513303^2 .

It is a de Polignac number, because none of the positive numbers 2^k-61471175509409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61471175509309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7698884 + ... + 13498709.

It is an arithmetic number, because the mean of its divisors is an integer number (2806508451615).

Almost surely, 2^{61471175509409} is an apocalyptic number.

It is an amenable number.

61471175509409 is a deficient number, since it is larger than the sum of its proper divisors (5885027329351).

61471175509409 is a wasteful number, since it uses less digits than its factorization.

61471175509409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21197937 (or 21197918 counting only the distinct ones).

The product of its (nonzero) digits is 9525600, while the sum is 59.

The spelling of 61471175509409 in words is "sixty-one trillion, four hundred seventy-one billion, one hundred seventy-five million, five hundred nine thousand, four hundred nine".