102123566 has 4 divisors (see below), whose sum is σ = 153185352. Its totient is φ = 51061782.

The previous prime is 102123563. The next prime is 102123629. The reversal of 102123566 is 665321201.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102123563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25530890 + ... + 25530893.

It is an arithmetic number, because the mean of its divisors is an integer number (38296338).

Almost surely, 2^102123566 is an apocalyptic number.

102123566 is a deficient number, since it is larger than the sum of its proper divisors (51061786).

102123566 is an equidigital number, since it uses as much as digits as its factorization.

102123566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51061785.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 102123566 is about 10105.6205153370. The cubic root of 102123566 is about 467.4214702186.

Adding to 102123566 its reverse (665321201), we get a palindrome (767444767).

The spelling of 102123566 in words is "one hundred two million, one hundred twenty-three thousand, five hundred sixty-six".