61273718133 has 4 divisors (see below), whose sum is σ = 81698290848. Its totient is φ = 40849145420.

The previous prime is 61273718131. The next prime is 61273718147. The reversal of 61273718133 is 33181737216.

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 61273718133 - 2¹ = 61273718131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61273718131) 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, 10212286353 + ... + 10212286358.

It is an arithmetic number, because the mean of its divisors is an integer number (20424572712).

Almost surely, 2^61273718133 is an apocalyptic number.

It is an amenable number.

61273718133 is a deficient number, since it is larger than the sum of its proper divisors (20424572715).

61273718133 is a wasteful number, since it uses less digits than its factorization.

61273718133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20424572714.

The product of its digits is 127008, while the sum is 42.

The spelling of 61273718133 in words is "sixty-one billion, two hundred seventy-three million, seven hundred eighteen thousand, one hundred thirty-three".