20761606815667 has 16 divisors (see below), whose sum is σ = 22027806760960. Its totient is φ = 19512774977472.

The previous prime is 20761606815619. The next prime is 20761606815707. The reversal of 20761606815667 is 76651860616702.

It is a cyclic number.

It is not a de Polignac number, because 20761606815667 - 2¹⁵ = 20761606782899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20761606815967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38783743 + ... + 39315415.

It is an arithmetic number, because the mean of its divisors is an integer number (1376737922560).

Almost surely, 2^{20761606815667} is an apocalyptic number.

20761606815667 is a deficient number, since it is larger than the sum of its proper divisors (1266199945293).

20761606815667 is a wasteful number, since it uses less digits than its factorization.

20761606815667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548002.

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 20761606815667 in words is "twenty trillion, seven hundred sixty-one billion, six hundred six million, eight hundred fifteen thousand, six hundred sixty-seven".