26665664002 has 4 divisors (see below), whose sum is σ = 39998496006. Its totient is φ = 13332832000.

The previous prime is 26665663993. The next prime is 26665664017. The reversal of 26665664002 is 20046656662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20046656662 = 2 ⋅10023328331.

It can be written as a sum of positive squares in only one way, i.e., 25856318401 + 809345601 = 160799^2 + 28449^2 .

It is a super-2 number, since 2×26665664002² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26665664002.

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, 6666415999 + ... + 6666416002.

Almost surely, 2^26665664002 is an apocalyptic number.

26665664002 is a deficient number, since it is larger than the sum of its proper divisors (13332832004).

26665664002 is a wasteful number, since it uses less digits than its factorization.

26665664002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13332832003.

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 26665664002 in words is "twenty-six billion, six hundred sixty-five million, six hundred sixty-four thousand, two".