20146755161657 has 4 divisors (see below), whose sum is σ = 20691262057956. Its totient is φ = 19602248265360.

The previous prime is 20146755161647. The next prime is 20146755161791. The reversal of 20146755161657 is 75616155764102.

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 11122865329216 + 9023889832441 = 3335096^2 + 3003979^2 .

It is a cyclic number.

It is not a de Polignac number, because 20146755161657 - 2²⁰ = 20146754113081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20146755161647) 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, 272253448094 + ... + 272253448167.

It is an arithmetic number, because the mean of its divisors is an integer number (5172815514489).

Almost surely, 2^{20146755161657} is an apocalyptic number.

It is an amenable number.

20146755161657 is a deficient number, since it is larger than the sum of its proper divisors (544506896299).

20146755161657 is an equidigital number, since it uses as much as digits as its factorization.

20146755161657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544506896298.

The product of its (nonzero) digits is 10584000, while the sum is 56.

The spelling of 20146755161657 in words is "twenty trillion, one hundred forty-six billion, seven hundred fifty-five million, one hundred sixty-one thousand, six hundred fifty-seven".