1516138666 has 16 divisors (see below), whose sum is σ = 2602658304. Its totient is φ = 648882864.

The previous prime is 1516138639. The next prime is 1516138667. The reversal of 1516138666 is 6668316151.

It is not an unprimeable number, because it can be changed into a prime (1516138667) 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, 63610 + ... + 84133.

It is an arithmetic number, because the mean of its divisors is an integer number (162666144).

Almost surely, 2^1516138666 is an apocalyptic number.

1516138666 is a deficient number, since it is larger than the sum of its proper divisors (1086519638).

1516138666 is a wasteful number, since it uses less digits than its factorization.

1516138666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148485.

The product of its digits is 155520, while the sum is 43.

The square root of 1516138666 is about 38937.6253256410. The cubic root of 1516138666 is about 1148.8049756319.

The spelling of 1516138666 in words is "one billion, five hundred sixteen million, one hundred thirty-eight thousand, six hundred sixty-six".