61679451729 has 12 divisors (see below), whose sum is σ = 95666088624. Its totient is φ = 35245400904.

The previous prime is 61679451721. The next prime is 61679451737. The reversal of 61679451729 is 92715497616.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61679451721) and next prime (61679451737).

It is not a de Polignac number, because 61679451729 - 2³ = 61679451721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61679451721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209793907 + ... + 209794200.

It is an arithmetic number, because the mean of its divisors is an integer number (7972174052).

Almost surely, 2^61679451729 is an apocalyptic number.

It is an amenable number.

61679451729 is a deficient number, since it is larger than the sum of its proper divisors (33986636895).

61679451729 is a wasteful number, since it uses less digits than its factorization.

61679451729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419588124 (or 419588117 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 57.

The spelling of 61679451729 in words is "sixty-one billion, six hundred seventy-nine million, four hundred fifty-one thousand, seven hundred twenty-nine".