61171356977 has 2 divisors, whose sum is σ = 61171356978. Its totient is φ = 61171356976.

The previous prime is 61171356959. The next prime is 61171357063. The reversal of 61171356977 is 77965317116.

61171356977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39702953536 + 21468403441 = 199256^2 + 146521^2 .

It is a cyclic number.

It is not a de Polignac number, because 61171356977 - 2⁸ = 61171356721 is a prime.

It is not a weakly prime, because it can be changed into another prime (61171356947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30585678488 + 30585678489.

It is an arithmetic number, because the mean of its divisors is an integer number (30585678489).

Almost surely, 2^61171356977 is an apocalyptic number.

It is an amenable number.

61171356977 is a deficient number, since it is larger than the sum of its proper divisors (1).

61171356977 is an equidigital number, since it uses as much as digits as its factorization.

61171356977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1666980, while the sum is 53.

The spelling of 61171356977 in words is "sixty-one billion, one hundred seventy-one million, three hundred fifty-six thousand, nine hundred seventy-seven".