61677778339 has 4 divisors (see below), whose sum is σ = 61678739920. Its totient is φ = 61676816760.

The previous prime is 61677778273. The next prime is 61677778363. The reversal of 61677778339 is 93387777616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61677778339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61677778399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377127 + ... + 515344.

It is an arithmetic number, because the mean of its divisors is an integer number (15419684980).

Almost surely, 2^61677778339 is an apocalyptic number.

61677778339 is a deficient number, since it is larger than the sum of its proper divisors (961581).

61677778339 is an equidigital number, since it uses as much as digits as its factorization.

61677778339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961580.

The product of its digits is 56010528, while the sum is 64.

The spelling of 61677778339 in words is "sixty-one billion, six hundred seventy-seven million, seven hundred seventy-eight thousand, three hundred thirty-nine".