102778952057 has 2 divisors, whose sum is σ = 102778952058. Its totient is φ = 102778952056.

The previous prime is 102778951967. The next prime is 102778952063. The reversal of 102778952057 is 750259877201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91942974841 + 10835977216 = 303221^2 + 104096^2 .

It is a cyclic number.

It is not a de Polignac number, because 102778952057 - 2⁸ = 102778951801 is a prime.

It is not a weakly prime, because it can be changed into another prime (102778952657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51389476028 + 51389476029.

It is an arithmetic number, because the mean of its divisors is an integer number (51389476029).

Almost surely, 2^102778952057 is an apocalyptic number.

It is an amenable number.

102778952057 is a deficient number, since it is larger than the sum of its proper divisors (1).

102778952057 is an equidigital number, since it uses as much as digits as its factorization.

102778952057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2469600, while the sum is 53.

The spelling of 102778952057 in words is "one hundred two billion, seven hundred seventy-eight million, nine hundred fifty-two thousand, fifty-seven".