20556651517061 has 8 divisors (see below), whose sum is σ = 22426392696384. Its totient is φ = 18687069450720.

The previous prime is 20556651516941. The next prime is 20556651517081. The reversal of 20556651517061 is 16071515665502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20556651517061 - 2³⁸ = 20281773610117 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 (20556651517081) 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, 39508025 + ... + 40024958.

It is an arithmetic number, because the mean of its divisors is an integer number (2803299087048).

Almost surely, 2^{20556651517061} is an apocalyptic number.

It is an amenable number.

20556651517061 is a deficient number, since it is larger than the sum of its proper divisors (1869741179323).

20556651517061 is a wasteful number, since it uses less digits than its factorization.

20556651517061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79556491.

The product of its (nonzero) digits is 1890000, while the sum is 50.

The spelling of 20556651517061 in words is "twenty trillion, five hundred fifty-six billion, six hundred fifty-one million, five hundred seventeen thousand, sixty-one".