266020503464651 has 4 divisors (see below), whose sum is σ = 286483619115792. Its totient is φ = 245557387813512.

The previous prime is 266020503464609. The next prime is 266020503464657. The reversal of 266020503464651 is 156464305020662.

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

It is a cyclic number.

It is not a de Polignac number, because 266020503464651 - 2³⁸ = 265745625557707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266020503464651.

It is not an unprimeable number, because it can be changed into a prime (266020503464657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10231557825551 + ... + 10231557825576.

It is an arithmetic number, because the mean of its divisors is an integer number (71620904778948).

Almost surely, 2^{266020503464651} is an apocalyptic number.

266020503464651 is a deficient number, since it is larger than the sum of its proper divisors (20463115651141).

266020503464651 is a wasteful number, since it uses less digits than its factorization.

266020503464651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20463115651140.

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

The spelling of 266020503464651 in words is "two hundred sixty-six trillion, twenty billion, five hundred three million, four hundred sixty-four thousand, six hundred fifty-one".