61629996879 has 20 divisors (see below), whose sum is σ = 100434070440. Its totient is φ = 37351512720.

The previous prime is 61629996859. The next prime is 61629996887. The reversal of 61629996879 is 97869992616.

It is not a de Polignac number, because 61629996879 - 2⁹ = 61629996367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61629996829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34583844 + ... + 34585625.

It is an arithmetic number, because the mean of its divisors is an integer number (5021703522).

Almost surely, 2^61629996879 is an apocalyptic number.

61629996879 is a deficient number, since it is larger than the sum of its proper divisors (38804073561).

61629996879 is a wasteful number, since it uses less digits than its factorization.

61629996879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69169492 (or 69169483 counting only the distinct ones).

The product of its digits is 158723712, while the sum is 72.

The spelling of 61629996879 in words is "sixty-one billion, six hundred twenty-nine million, nine hundred ninety-six thousand, eight hundred seventy-nine".