20346331655561 has 4 divisors (see below), whose sum is σ = 21417191216400. Its totient is φ = 19275472094724.

The previous prime is 20346331655473. The next prime is 20346331655567. The reversal of 20346331655561 is 16555613364302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20346331655561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20346331655567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535429780391 + ... + 535429780428.

It is an arithmetic number, because the mean of its divisors is an integer number (5354297804100).

Almost surely, 2^{20346331655561} is an apocalyptic number.

It is an amenable number.

20346331655561 is a deficient number, since it is larger than the sum of its proper divisors (1070859560839).

20346331655561 is a wasteful number, since it uses less digits than its factorization.

20346331655561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070859560838.

The product of its (nonzero) digits is 5832000, while the sum is 50.

The spelling of 20346331655561 in words is "twenty trillion, three hundred forty-six billion, three hundred thirty-one million, six hundred fifty-five thousand, five hundred sixty-one".