61864779739 has 4 divisors (see below), whose sum is σ = 70702605424. Its totient is φ = 53026954056.

The previous prime is 61864779719. The next prime is 61864779773. The reversal of 61864779739 is 93797746816.

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

It is a cyclic number.

It is not a de Polignac number, because 61864779739 - 2¹¹ = 61864777691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61864779719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4418912832 + ... + 4418912845.

It is an arithmetic number, because the mean of its divisors is an integer number (17675651356).

Almost surely, 2^61864779739 is an apocalyptic number.

61864779739 is a deficient number, since it is larger than the sum of its proper divisors (8837825685).

61864779739 is an equidigital number, since it uses as much as digits as its factorization.

61864779739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8837825684.

The product of its digits is 96018048, while the sum is 67.

The spelling of 61864779739 in words is "sixty-one billion, eight hundred sixty-four million, seven hundred seventy-nine thousand, seven hundred thirty-nine".