26346021666 has 16 divisors (see below), whose sum is σ = 52807348704. Its totient is φ = 8762789664.

The previous prime is 26346021629. The next prime is 26346021683. The reversal of 26346021666 is 66612064362.

It is a super-2 number, since 2×26346021666² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4801420 + ... + 4806903.

It is an arithmetic number, because the mean of its divisors is an integer number (3300459294).

Almost surely, 2^26346021666 is an apocalyptic number.

26346021666 is an abundant number, since it is smaller than the sum of its proper divisors (26461327038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26346021666 is a wasteful number, since it uses less digits than its factorization.

26346021666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9608785.

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 26346021666 in words is "twenty-six billion, three hundred forty-six million, twenty-one thousand, six hundred sixty-six".