102138604457 has 2 divisors, whose sum is σ = 102138604458. Its totient is φ = 102138604456.

The previous prime is 102138604429. The next prime is 102138604471. The reversal of 102138604457 is 754406831201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87034440256 + 15104164201 = 295016^2 + 122899^2 .

It is a cyclic number.

It is not a de Polignac number, because 102138604457 - 2¹⁶ = 102138538921 is a prime.

It is not a weakly prime, because it can be changed into another prime (102138604427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51069302228 + 51069302229.

It is an arithmetic number, because the mean of its divisors is an integer number (51069302229).

Almost surely, 2^102138604457 is an apocalyptic number.

It is an amenable number.

102138604457 is a deficient number, since it is larger than the sum of its proper divisors (1).

102138604457 is an equidigital number, since it uses as much as digits as its factorization.

102138604457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 102138604457 in words is "one hundred two billion, one hundred thirty-eight million, six hundred four thousand, four hundred fifty-seven".