20513062501666 has 16 divisors (see below), whose sum is σ = 35192787425856. Its totient is φ = 8784428144976.

The previous prime is 20513062501661. The next prime is 20513062501667. The reversal of 20513062501666 is 66610526031502.

It is not an unprimeable number, because it can be changed into a prime (20513062501661) 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, 573677796 + ... + 573713551.

It is an arithmetic number, because the mean of its divisors is an integer number (2199549214116).

Almost surely, 2^{20513062501666} is an apocalyptic number.

20513062501666 is a deficient number, since it is larger than the sum of its proper divisors (14679724924190).

20513062501666 is a wasteful number, since it uses less digits than its factorization.

20513062501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147392633.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 20513062501666 in words is "twenty trillion, five hundred thirteen billion, sixty-two million, five hundred one thousand, six hundred sixty-six".