103378721566 has 4 divisors (see below), whose sum is σ = 155068082352. Its totient is φ = 51689360782.

The previous prime is 103378721543. The next prime is 103378721609. The reversal of 103378721566 is 665127873301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665127873301 = 23 ⋅28918603187.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25844680390 + ... + 25844680393.

It is an arithmetic number, because the mean of its divisors is an integer number (38767020588).

Almost surely, 2^103378721566 is an apocalyptic number.

103378721566 is a deficient number, since it is larger than the sum of its proper divisors (51689360786).

103378721566 is an equidigital number, since it uses as much as digits as its factorization.

103378721566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51689360785.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 103378721566 in words is "one hundred three billion, three hundred seventy-eight million, seven hundred twenty-one thousand, five hundred sixty-six".