20161657155 has 8 divisors (see below), whose sum is σ = 32258651472. Its totient is φ = 10752883808.

The previous prime is 20161657141. The next prime is 20161657157. The reversal of 20161657155 is 55175616102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20161657155 - 2⁵ = 20161657123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20161657157) 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, 672055224 + ... + 672055253.

It is an arithmetic number, because the mean of its divisors is an integer number (4032331434).

Almost surely, 2^20161657155 is an apocalyptic number.

20161657155 is a deficient number, since it is larger than the sum of its proper divisors (12096994317).

20161657155 is a wasteful number, since it uses less digits than its factorization.

20161657155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344110485.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 20161657155 in words is "twenty billion, one hundred sixty-one million, six hundred fifty-seven thousand, one hundred fifty-five".