168618994 has 4 divisors (see below), whose sum is σ = 252928494. Its totient is φ = 84309496.

The previous prime is 168618973. The next prime is 168619037. The reversal of 168618994 is 499816861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 129117769 + 39501225 = 11363^2 + 6285^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42154747 + ... + 42154750.

Almost surely, 2^168618994 is an apocalyptic number.

168618994 is a deficient number, since it is larger than the sum of its proper divisors (84309500).

168618994 is an equidigital number, since it uses as much as digits as its factorization.

168618994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84309499.

The product of its digits is 746496, while the sum is 52.

The square root of 168618994 is about 12985.3376544470. The cubic root of 168618994 is about 552.4616862248.

The spelling of 168618994 in words is "one hundred sixty-eight million, six hundred eighteen thousand, nine hundred ninety-four".