20155653657 has 16 divisors (see below), whose sum is σ = 29944831680. Its totient is φ = 13399030656.

The previous prime is 20155653647. The next prime is 20155653673. The reversal of 20155653657 is 75635655102.

20155653657 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 565 + 36 + 57 = 666.

It is not a de Polignac number, because 20155653657 - 2¹¹ = 20155651609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20155653647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1047843 + ... + 1066904.

It is an arithmetic number, because the mean of its divisors is an integer number (1871551980).

Almost surely, 2^20155653657 is an apocalyptic number.

20155653657 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20155653657 is a deficient number, since it is larger than the sum of its proper divisors (9789178023).

20155653657 is a wasteful number, since it uses less digits than its factorization.

20155653657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115109 (or 2115103 counting only the distinct ones).

The product of its (nonzero) digits is 945000, while the sum is 45.

The spelling of 20155653657 in words is "twenty billion, one hundred fifty-five million, six hundred fifty-three thousand, six hundred fifty-seven".