20868264661 has 8 divisors (see below), whose sum is σ = 22560286880. Its totient is φ = 19235611728.

The previous prime is 20868264649. The next prime is 20868264701. The reversal of 20868264661 is 16646286802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20868264661 - 2⁵ = 20868264629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868264061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14841591 + ... + 14842996.

It is an arithmetic number, because the mean of its divisors is an integer number (2820035860).

Almost surely, 2^20868264661 is an apocalyptic number.

It is an amenable number.

20868264661 is a deficient number, since it is larger than the sum of its proper divisors (1692022219).

20868264661 is a wasteful number, since it uses less digits than its factorization.

20868264661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29684643.

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 20868264661 in words is "twenty billion, eight hundred sixty-eight million, two hundred sixty-four thousand, six hundred sixty-one".