164687557 has 4 divisors (see below), whose sum is σ = 164867680. Its totient is φ = 164507436.

The previous prime is 164687533. The next prime is 164687581. The reversal of 164687557 is 755786461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (164687533) and next prime (164687581).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164687557 is a prime.

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 164687557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164687527) 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, 88683 + ... + 90520.

It is an arithmetic number, because the mean of its divisors is an integer number (41216920).

Almost surely, 2^164687557 is an apocalyptic number.

It is an amenable number.

164687557 is a deficient number, since it is larger than the sum of its proper divisors (180123).

164687557 is an equidigital number, since it uses as much as digits as its factorization.

164687557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180122.

The product of its digits is 1411200, while the sum is 49.

The square root of 164687557 is about 12833.0649885364. The cubic root of 164687557 is about 548.1342366109.

It can be divided in two parts, 16468 and 7557, that added together give a square (24025 = 155²).

The spelling of 164687557 in words is "one hundred sixty-four million, six hundred eighty-seven thousand, five hundred fifty-seven".