61000195405 has 4 divisors (see below), whose sum is σ = 73200234492. Its totient is φ = 48800156320.

The previous prime is 61000195393. The next prime is 61000195427. The reversal of 61000195405 is 50459100016.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42937641796 + 18062553609 = 207214^2 + 134397^2 .

It is not a de Polignac number, because 61000195405 - 2¹¹ = 61000193357 is a prime.

It is a super-2 number, since 2×61000195405² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6100019536 + ... + 6100019545.

It is an arithmetic number, because the mean of its divisors is an integer number (18300058623).

Almost surely, 2^61000195405 is an apocalyptic number.

It is an amenable number.

61000195405 is a deficient number, since it is larger than the sum of its proper divisors (12200039087).

61000195405 is a wasteful number, since it uses less digits than its factorization.

61000195405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12200039086.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 61000195405 in words is "sixty-one billion, one hundred ninety-five thousand, four hundred five".