20315264062661 has 4 divisors (see below), whose sum is σ = 20318116936524. Its totient is φ = 20312411188800.

The previous prime is 20315264062657. The next prime is 20315264062663. The reversal of 20315264062661 is 16626046251302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 531280632100 + 19783983430561 = 728890^2 + 4447919^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315264062661 - 2² = 20315264062657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315264062663) 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 3 ways as a sum of consecutive naturals, for example, 1426426250 + ... + 1426440491.

It is an arithmetic number, because the mean of its divisors is an integer number (5079529234131).

Almost surely, 2^{20315264062661} is an apocalyptic number.

It is an amenable number.

20315264062661 is a deficient number, since it is larger than the sum of its proper divisors (2852873863).

20315264062661 is an equidigital number, since it uses as much as digits as its factorization.

20315264062661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852873862.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 20315264062661 in words is "twenty trillion, three hundred fifteen billion, two hundred sixty-four million, sixty-two thousand, six hundred sixty-one".