26646654506 has 4 divisors (see below), whose sum is σ = 39969981762. Its totient is φ = 13323327252.

The previous prime is 26646654493. The next prime is 26646654511. The reversal of 26646654506 is 60545664662.

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

It can be written as a sum of positive squares in only one way, i.e., 18335597281 + 8311057225 = 135409^2 + 91165^2 .

It is a super-4 number, since 4×26646654506⁴ (a number of 43 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6661663625 + ... + 6661663628.

Almost surely, 2^26646654506 is an apocalyptic number.

26646654506 is a deficient number, since it is larger than the sum of its proper divisors (13323327256).

26646654506 is a wasteful number, since it uses less digits than its factorization.

26646654506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13323327255.

The product of its (nonzero) digits is 6220800, while the sum is 50.

The spelling of 26646654506 in words is "twenty-six billion, six hundred forty-six million, six hundred fifty-four thousand, five hundred six".