61816372105 has 4 divisors (see below), whose sum is σ = 74179646532. Its totient is φ = 49453097680.

The previous prime is 61816372103. The next prime is 61816372109. The reversal of 61816372105 is 50127361816.

It is a happy number.

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 31087684489 + 30728687616 = 176317^2 + 175296^2 .

It is not a de Polignac number, because 61816372105 - 2¹ = 61816372103 is a prime.

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (61816372103) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6181637206 + ... + 6181637215.

It is an arithmetic number, because the mean of its divisors is an integer number (18544911633).

Almost surely, 2^61816372105 is an apocalyptic number.

It is an amenable number.

61816372105 is a deficient number, since it is larger than the sum of its proper divisors (12363274427).

61816372105 is a wasteful number, since it uses less digits than its factorization.

61816372105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12363274426.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 61816372105 in words is "sixty-one billion, eight hundred sixteen million, three hundred seventy-two thousand, one hundred five".