20763665666655 has 32 divisors (see below), whose sum is σ = 33691734355968. Its totient is φ = 10917350035200.

The previous prime is 20763665666617. The next prime is 20763665666699. The reversal of 20763665666655 is 55666656636702.

It is not a de Polignac number, because 20763665666655 - 2⁶ = 20763665666591 is a prime.

It is a super-2 number, since 2×20763665666655² (a number of 27 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 20763665666655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18077170 + ... + 19191440.

It is an arithmetic number, because the mean of its divisors is an integer number (1052866698624).

Almost surely, 2^{20763665666655} is an apocalyptic number.

20763665666655 is a deficient number, since it is larger than the sum of its proper divisors (12928068689313).

20763665666655 is a wasteful number, since it uses less digits than its factorization.

20763665666655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131847.

The product of its (nonzero) digits is 1469664000, while the sum is 69.

The spelling of 20763665666655 in words is "twenty trillion, seven hundred sixty-three billion, six hundred sixty-five million, six hundred sixty-six thousand, six hundred fifty-five".