1518861668 has 12 divisors (see below), whose sum is σ = 2814361452. Its totient is φ = 714758400.

The previous prime is 1518861623. The next prime is 1518861703. The reversal of 1518861668 is 8661688151.

It can be written as a sum of positive squares in 2 ways, for example, as 1374333184 + 144528484 = 37072^2 + 12022^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11168033 + ... + 11168168.

It is an arithmetic number, because the mean of its divisors is an integer number (234530121).

Almost surely, 2^1518861668 is an apocalyptic number.

It is an amenable number.

1518861668 is a deficient number, since it is larger than the sum of its proper divisors (1295499784).

1518861668 is a wasteful number, since it uses less digits than its factorization.

1518861668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22336222 (or 22336220 counting only the distinct ones).

The product of its digits is 552960, while the sum is 50.

The square root of 1518861668 is about 38972.5758450734. The cubic root of 1518861668 is about 1149.4923198313.

The spelling of 1518861668 in words is "one billion, five hundred eighteen million, eight hundred sixty-one thousand, six hundred sixty-eight".