20651061650 has 12 divisors (see below), whose sum is σ = 38410974762. Its totient is φ = 8260424640.

The previous prime is 20651061647. The next prime is 20651061653. The reversal of 20651061650 is 5616015602.

It is an interprime number because it is at equal distance from previous prime (20651061647) and next prime (20651061653).

It can be written as a sum of positive squares in 3 ways, for example, as 14370974641 + 6280087009 = 119879^2 + 79247^2 .

It is not an unprimeable number, because it can be changed into a prime (20651061653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 206510567 + ... + 206510666.

Almost surely, 2^20651061650 is an apocalyptic number.

20651061650 is a deficient number, since it is larger than the sum of its proper divisors (17759913112).

20651061650 is a wasteful number, since it uses less digits than its factorization.

20651061650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413021245 (or 413021240 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 20651061650 in words is "twenty billion, six hundred fifty-one million, sixty-one thousand, six hundred fifty".