115520421977 has 2 divisors, whose sum is σ = 115520421978. Its totient is φ = 115520421976.

The previous prime is 115520421931. The next prime is 115520422007. The reversal of 115520421977 is 779124025511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112641455641 + 2878966336 = 335621^2 + 53656^2 .

It is a cyclic number.

It is not a de Polignac number, because 115520421977 - 2²⁴ = 115503644761 is a prime.

It is not a weakly prime, because it can be changed into another prime (115520421917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57760210988 + 57760210989.

It is an arithmetic number, because the mean of its divisors is an integer number (57760210989).

Almost surely, 2^115520421977 is an apocalyptic number.

It is an amenable number.

115520421977 is a deficient number, since it is larger than the sum of its proper divisors (1).

115520421977 is an equidigital number, since it uses as much as digits as its factorization.

115520421977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 44.

The spelling of 115520421977 in words is "one hundred fifteen billion, five hundred twenty million, four hundred twenty-one thousand, nine hundred seventy-seven".