81652629794 has 4 divisors (see below), whose sum is σ = 122478944694. Its totient is φ = 40826314896.

The previous prime is 81652629791. The next prime is 81652629803. The reversal of 81652629794 is 49792625618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 80613405625 + 1039224169 = 283925^2 + 32237^2 .

It is not an unprimeable number, because it can be changed into a prime (81652629791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20413157447 + ... + 20413157450.

Almost surely, 2^81652629794 is an apocalyptic number.

81652629794 is a deficient number, since it is larger than the sum of its proper divisors (40826314900).

81652629794 is a wasteful number, since it uses less digits than its factorization.

81652629794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40826314899.

The product of its digits is 13063680, while the sum is 59.

The spelling of 81652629794 in words is "eighty-one billion, six hundred fifty-two million, six hundred twenty-nine thousand, seven hundred ninety-four".