61100559977 has 2 divisors, whose sum is σ = 61100559978. Its totient is φ = 61100559976.

The previous prime is 61100559967. The next prime is 61100560009. The reversal of 61100559977 is 77995500116.

61100559977 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., 60272214016 + 828345961 = 245504^2 + 28781^2 .

It is a cyclic number.

It is not a de Polignac number, because 61100559977 - 2⁶ = 61100559913 is a prime.

It is not a weakly prime, because it can be changed into another prime (61100559967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30550279988 + 30550279989.

It is an arithmetic number, because the mean of its divisors is an integer number (30550279989).

Almost surely, 2^61100559977 is an apocalyptic number.

It is an amenable number.

61100559977 is a deficient number, since it is larger than the sum of its proper divisors (1).

61100559977 is an equidigital number, since it uses as much as digits as its factorization.

61100559977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 595350, while the sum is 50.

The spelling of 61100559977 in words is "sixty-one billion, one hundred million, five hundred fifty-nine thousand, nine hundred seventy-seven".