20661266502 has 12 divisors (see below), whose sum is σ = 44766077460. Its totient is φ = 6887088828.

The previous prime is 20661266473. The next prime is 20661266513. The reversal of 20661266502 is 20566216602.

20661266502 is a `hidden beast` number, since 20 + 6 + 6 + 126 + 6 + 502 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 573924052 + ... + 573924087.

It is an arithmetic number, because the mean of its divisors is an integer number (3730506455).

Almost surely, 2^20661266502 is an apocalyptic number.

20661266502 is an abundant number, since it is smaller than the sum of its proper divisors (24104810958).

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

20661266502 is a wasteful number, since it uses less digits than its factorization.

20661266502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147848147 (or 1147848144 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20661266502 in words is "twenty billion, six hundred sixty-one million, two hundred sixty-six thousand, five hundred two".