20261654661 has 16 divisors (see below), whose sum is σ = 28234031616. Its totient is φ = 12900353136.

The previous prime is 20261654449. The next prime is 20261654671. The reversal of 20261654661 is 16645616202.

It is not a de Polignac number, because 20261654661 - 2²² = 20257460357 is a prime.

It is a super-3 number, since 3×20261654661³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20261654671) 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, 183975 + ... + 272708.

It is an arithmetic number, because the mean of its divisors is an integer number (1764626976).

Almost surely, 2^20261654661 is an apocalyptic number.

It is an amenable number.

20261654661 is a deficient number, since it is larger than the sum of its proper divisors (7972376955).

20261654661 is a wasteful number, since it uses less digits than its factorization.

20261654661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457352.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 20261654661 in words is "twenty billion, two hundred sixty-one million, six hundred fifty-four thousand, six hundred sixty-one".