666736740334 has 64 divisors (see below), whose sum is σ = 1211961507840. Its totient is φ = 268724913120.

The previous prime is 666736740269. The next prime is 666736740347. The reversal of 666736740334 is 433047637666.

It is a happy number.

It is a super-2 number, since 2×666736740334² (a number of 24 digits) contains 22 as substring.

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, 24729049 + ... + 24755995.

It is an arithmetic number, because the mean of its divisors is an integer number (18936898560).

Almost surely, 2^666736740334 is an apocalyptic number.

666736740334 is a deficient number, since it is larger than the sum of its proper divisors (545224767506).

666736740334 is a wasteful number, since it uses less digits than its factorization.

666736740334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27653.

The product of its (nonzero) digits is 27433728, while the sum is 55.

The spelling of 666736740334 in words is "six hundred sixty-six billion, seven hundred thirty-six million, seven hundred forty thousand, three hundred thirty-four".