20415112345661 has 24 divisors (see below), whose sum is σ = 22567711320000. Its totient is φ = 18453385596800.

The previous prime is 20415112345561. The next prime is 20415112345669. The reversal of 20415112345661 is 16654321151402.

It is not a de Polignac number, because 20415112345661 - 2³⁴ = 20397932476477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415112345669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206165840 + ... + 206264838.

It is an arithmetic number, because the mean of its divisors is an integer number (940321305000).

Almost surely, 2^{20415112345661} is an apocalyptic number.

It is an amenable number.

20415112345661 is a deficient number, since it is larger than the sum of its proper divisors (2152598974339).

20415112345661 is a wasteful number, since it uses less digits than its factorization.

20415112345661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108721 (or 108710 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 20415112345661 in words is "twenty trillion, four hundred fifteen billion, one hundred twelve million, three hundred forty-five thousand, six hundred sixty-one".