20611266501616 has 40 divisors (see below), whose sum is σ = 45639620178944. Its totient is φ = 8833324985280.

The previous prime is 20611266501613. The next prime is 20611266501649. The reversal of 20611266501616 is 61610566211602.

It is a super-2 number, since 2×20611266501616² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20611266501613) 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, 13667821 + ... + 15100723.

Almost surely, 2^{20611266501616} is an apocalyptic number.

It is an amenable number.

20611266501616 is an abundant number, since it is smaller than the sum of its proper divisors (25028353677328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20611266501616 is a wasteful number, since it uses less digits than its factorization.

20611266501616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561349 (or 1561343 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 20611266501616 in words is "twenty trillion, six hundred eleven billion, two hundred sixty-six million, five hundred one thousand, six hundred sixteen".