61667246777 has 2 divisors, whose sum is σ = 61667246778. Its totient is φ = 61667246776.

The previous prime is 61667246701. The next prime is 61667246779. The reversal of 61667246777 is 77764276616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54873531001 + 6793715776 = 234251^2 + 82424^2 .

It is a cyclic number.

It is not a de Polignac number, because 61667246777 - 2¹⁰ = 61667245753 is a prime.

Together with 61667246779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61667246779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30833623388 + 30833623389.

It is an arithmetic number, because the mean of its divisors is an integer number (30833623389).

Almost surely, 2^61667246777 is an apocalyptic number.

It is an amenable number.

61667246777 is a deficient number, since it is larger than the sum of its proper divisors (1).

61667246777 is an equidigital number, since it uses as much as digits as its factorization.

61667246777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24893568, while the sum is 59.

The spelling of 61667246777 in words is "sixty-one billion, six hundred sixty-seven million, two hundred forty-six thousand, seven hundred seventy-seven".