61729026718 has 4 divisors (see below), whose sum is σ = 92593540080. Its totient is φ = 30864513358.

The previous prime is 61729026707. The next prime is 61729026739. The reversal of 61729026718 is 81762092716.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15432256678 + ... + 15432256681.

It is an arithmetic number, because the mean of its divisors is an integer number (23148385020).

Almost surely, 2^61729026718 is an apocalyptic number.

61729026718 is a deficient number, since it is larger than the sum of its proper divisors (30864513362).

61729026718 is a wasteful number, since it uses less digits than its factorization.

61729026718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30864513361.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 61729026718 in words is "sixty-one billion, seven hundred twenty-nine million, twenty-six thousand, seven hundred eighteen".