168657481 has 4 divisors (see below), whose sum is σ = 172579792. Its totient is φ = 164735172.

The previous prime is 168657449. The next prime is 168657499. The reversal of 168657481 is 184756861.

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 a cyclic number.

It is not a de Polignac number, because 168657481 - 2⁵ = 168657449 is a prime.

It is a super-2 number, since 2×168657481² = 56890691794530722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168657431) 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, 1961091 + ... + 1961176.

It is an arithmetic number, because the mean of its divisors is an integer number (43144948).

Almost surely, 2^168657481 is an apocalyptic number.

It is an amenable number.

168657481 is a deficient number, since it is larger than the sum of its proper divisors (3922311).

168657481 is an equidigital number, since it uses as much as digits as its factorization.

168657481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3922310.

The product of its digits is 322560, while the sum is 46.

The square root of 168657481 is about 12986.8195105653. The cubic root of 168657481 is about 552.5037158421.

The spelling of 168657481 in words is "one hundred sixty-eight million, six hundred fifty-seven thousand, four hundred eighty-one".