163551557 has 8 divisors (see below), whose sum is σ = 177749880. Its totient is φ = 149584320.

The previous prime is 163551541. The next prime is 163551589. The reversal of 163551557 is 755155361.

It can be written as a sum of positive squares in 4 ways, for example, as 11621281 + 151930276 = 3409^2 + 12326^2 .

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 163551557 - 2⁴ = 163551541 is a prime.

It is a super-2 number, since 2×163551557² = 53498223594248498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163551557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163541557) 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, 56294 + ... + 59127.

It is an arithmetic number, because the mean of its divisors is an integer number (22218735).

Almost surely, 2^163551557 is an apocalyptic number.

It is an amenable number.

163551557 is a deficient number, since it is larger than the sum of its proper divisors (14198323).

163551557 is a wasteful number, since it uses less digits than its factorization.

163551557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115543.

The product of its digits is 78750, while the sum is 38.

The square root of 163551557 is about 12788.7277318739. The cubic root of 163551557 is about 546.8710006434.

The spelling of 163551557 in words is "one hundred sixty-three million, five hundred fifty-one thousand, five hundred fifty-seven".