61673765909 has 16 divisors (see below), whose sum is σ = 73569792000. Its totient is φ = 50550421680.

The previous prime is 61673765903. The next prime is 61673765917. The reversal of 61673765909 is 90956737616.

61673765909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61673765909 - 2²⁴ = 61656988693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61673765903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531842 + ... + 637340.

It is an arithmetic number, because the mean of its divisors is an integer number (4598112000).

Almost surely, 2^61673765909 is an apocalyptic number.

It is an amenable number.

61673765909 is a deficient number, since it is larger than the sum of its proper divisors (11896026091).

61673765909 is a wasteful number, since it uses less digits than its factorization.

61673765909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109160.

The product of its (nonzero) digits is 12859560, while the sum is 59.

The spelling of 61673765909 in words is "sixty-one billion, six hundred seventy-three million, seven hundred sixty-five thousand, nine hundred nine".