12345555566690 has 32 divisors (see below), whose sum is σ = 22426875460080. Its totient is φ = 4892726401024.

The previous prime is 12345555566657. The next prime is 12345555566731. The reversal of 12345555566690 is 9666555554321.

It can be written as a sum of positive squares in 8 ways, for example, as 9126362454169 + 3219193112521 = 3020987^2 + 1794211^2 .

It is a super-2 number, since 2×12345555566690² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1082072 + ... + 5085468.

Almost surely, 2^{12345555566690} is an apocalyptic number.

12345555566690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12345555566690 is a deficient number, since it is larger than the sum of its proper divisors (10081319893390).

12345555566690 is a wasteful number, since it uses less digits than its factorization.

12345555566690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006246.

The product of its (nonzero) digits is 145800000, while the sum is 62.

The spelling of 12345555566690 in words is "twelve trillion, three hundred forty-five billion, five hundred fifty-five million, five hundred sixty-six thousand, six hundred ninety".