81079656253 has 2 divisors, whose sum is σ = 81079656254. Its totient is φ = 81079656252.

The previous prime is 81079656193. The next prime is 81079656263. The reversal of 81079656253 is 35265697018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47148911044 + 33930745209 = 217138^2 + 184203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81079656253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81079656253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81079656263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539828126 + 40539828127.

It is an arithmetic number, because the mean of its divisors is an integer number (40539828127).

Almost surely, 2^81079656253 is an apocalyptic number.

It is an amenable number.

81079656253 is a deficient number, since it is larger than the sum of its proper divisors (1).

81079656253 is an equidigital number, since it uses as much as digits as its factorization.

81079656253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 81079656253 in words is "eighty-one billion, seventy-nine million, six hundred fifty-six thousand, two hundred fifty-three".