61743927109 has 4 divisors (see below), whose sum is σ = 62343382816. Its totient is φ = 61144471404.

The previous prime is 61743927103. The next prime is 61743927127. The reversal of 61743927109 is 90172934716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61743927109 - 2¹⁵ = 61743894341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61743927103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299727699 + ... + 299727904.

It is an arithmetic number, because the mean of its divisors is an integer number (15585845704).

Almost surely, 2^61743927109 is an apocalyptic number.

It is an amenable number.

61743927109 is a deficient number, since it is larger than the sum of its proper divisors (599455707).

61743927109 is a wasteful number, since it uses less digits than its factorization.

61743927109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599455706.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 61743927109 in words is "sixty-one billion, seven hundred forty-three million, nine hundred twenty-seven thousand, one hundred nine".