20125526661621 has 12 divisors (see below), whose sum is σ = 29071945813248. Its totient is φ = 13416214404264.

The previous prime is 20125526661607. The next prime is 20125526661649. The reversal of 20125526661621 is 12616662552102.

It is not a de Polignac number, because 20125526661621 - 2¹⁸ = 20125526399477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125526661221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66788835 + ... + 67089488.

It is an arithmetic number, because the mean of its divisors is an integer number (2422662151104).

Almost surely, 2^{20125526661621} is an apocalyptic number.

It is an amenable number.

20125526661621 is a deficient number, since it is larger than the sum of its proper divisors (8946419151627).

20125526661621 is a wasteful number, since it uses less digits than its factorization.

20125526661621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133895032 (or 133895029 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 20125526661621 in words is "twenty trillion, one hundred twenty-five billion, five hundred twenty-six million, six hundred sixty-one thousand, six hundred twenty-one".