66666669999998 has 64 divisors (see below), whose sum is σ = 104344750540800. Its totient is φ = 31921253130240.

The previous prime is 66666669999971. The next prime is 66666670000033. The reversal of 66666669999998 is 89999996666666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1879981988 + ... + 1880017448.

It is an arithmetic number, because the mean of its divisors is an integer number (1630386727200).

Almost surely, 2^{66666669999998} is an apocalyptic number.

66666669999998 is a deficient number, since it is larger than the sum of its proper divisors (37678080540802).

66666669999998 is a wasteful number, since it uses less digits than its factorization.

66666669999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37145.

The product of its digits is 1190155742208, while the sum is 104.

The spelling of 66666669999998 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred sixty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".