61271239873 has 4 divisors (see below), whose sum is σ = 63935206848. Its totient is φ = 58607272900.

The previous prime is 61271239867. The next prime is 61271239937. The reversal of 61271239873 is 37893217216.

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 de Polignac number, because none of the positive numbers 2^k-61271239873 is a prime.

It is a super-2 number, since 2×61271239873² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61271239823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331983453 + ... + 1331983498.

It is an arithmetic number, because the mean of its divisors is an integer number (15983801712).

Almost surely, 2^61271239873 is an apocalyptic number.

It is an amenable number.

61271239873 is a deficient number, since it is larger than the sum of its proper divisors (2663966975).

61271239873 is a wasteful number, since it uses less digits than its factorization.

61271239873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663966974.

The product of its digits is 762048, while the sum is 49.

The spelling of 61271239873 in words is "sixty-one billion, two hundred seventy-one million, two hundred thirty-nine thousand, eight hundred seventy-three".