128477006761 has 2 divisors, whose sum is σ = 128477006762. Its totient is φ = 128477006760.

The previous prime is 128477006741. The next prime is 128477006767. The reversal of 128477006761 is 167600774821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125883040000 + 2593966761 = 354800^2 + 50931^2 .

It is a cyclic number.

It is not a de Polignac number, because 128477006761 - 2⁹ = 128477006249 is a prime.

It is a super-2 number, since 2×128477006761² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128477006767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64238503380 + 64238503381.

It is an arithmetic number, because the mean of its divisors is an integer number (64238503381).

Almost surely, 2^128477006761 is an apocalyptic number.

It is an amenable number.

128477006761 is a deficient number, since it is larger than the sum of its proper divisors (1).

128477006761 is an equidigital number, since it uses as much as digits as its factorization.

128477006761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 790272, while the sum is 49.

The spelling of 128477006761 in words is "one hundred twenty-eight billion, four hundred seventy-seven million, six thousand, seven hundred sixty-one".