61838243909 has 8 divisors (see below), whose sum is σ = 66605105112. Its totient is φ = 57072821760.

The previous prime is 61838243861. The next prime is 61838243933. The reversal of 61838243909 is 90934283816.

It is a happy number.

61838243909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 642369025 + 61195874884 = 25345^2 + 247378^2 .

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 61838243909 - 2⁸ = 61838243653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61838243009) 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, 269672 + ... + 443169.

It is an arithmetic number, because the mean of its divisors is an integer number (8325638139).

Almost surely, 2^61838243909 is an apocalyptic number.

It is an amenable number.

61838243909 is a deficient number, since it is larger than the sum of its proper divisors (4766861203).

61838243909 is a wasteful number, since it uses less digits than its factorization.

61838243909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719527.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 61838243909 in words is "sixty-one billion, eight hundred thirty-eight million, two hundred forty-three thousand, nine hundred nine".