61673806081 has 4 divisors (see below), whose sum is σ = 61759584000. Its totient is φ = 61588028164.

The previous prime is 61673806063. The next prime is 61673806087. The reversal of 61673806081 is 18060837616.

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 61673806081 - 2⁵ = 61673806049 is a prime.

It is a super-2 number, since 2×61673806081² (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 (61673806087) 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, 42887881 + ... + 42889318.

It is an arithmetic number, because the mean of its divisors is an integer number (15439896000).

Almost surely, 2^61673806081 is an apocalyptic number.

It is an amenable number.

61673806081 is a deficient number, since it is larger than the sum of its proper divisors (85777919).

61673806081 is an equidigital number, since it uses as much as digits as its factorization.

61673806081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85777918.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 61673806081 in words is "sixty-one billion, six hundred seventy-three million, eight hundred six thousand, eighty-one".