61072786057 has 2 divisors, whose sum is σ = 61072786058. Its totient is φ = 61072786056.

The previous prime is 61072785989. The next prime is 61072786091. The reversal of 61072786057 is 75068727016.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39944419321 + 21128366736 = 199861^2 + 145356^2 .

It is a cyclic number.

It is not a de Polignac number, because 61072786057 - 2¹⁵ = 61072753289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61072786057.

It is not a weakly prime, because it can be changed into another prime (61072786457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30536393028 + 30536393029.

It is an arithmetic number, because the mean of its divisors is an integer number (30536393029).

Almost surely, 2^61072786057 is an apocalyptic number.

It is an amenable number.

61072786057 is a deficient number, since it is larger than the sum of its proper divisors (1).

61072786057 is an equidigital number, since it uses as much as digits as its factorization.

61072786057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 61072786057 in words is "sixty-one billion, seventy-two million, seven hundred eighty-six thousand, fifty-seven".