20155653647 has 2 divisors, whose sum is σ = 20155653648. Its totient is φ = 20155653646.

The previous prime is 20155653613. The next prime is 20155653673. The reversal of 20155653647 is 74635655102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20155653647 - 2¹⁶ = 20155588111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20155653598 and 20155653607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20155653677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077826823 + 10077826824.

It is an arithmetic number, because the mean of its divisors is an integer number (10077826824).

Almost surely, 2^20155653647 is an apocalyptic number.

20155653647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155653647 is an equidigital number, since it uses as much as digits as its factorization.

20155653647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 20155653647 in words is "twenty billion, one hundred fifty-five million, six hundred fifty-three thousand, six hundred forty-seven".