666153538 has 16 divisors (see below), whose sum is σ = 1009765440. Its totient is φ = 329572656.

The previous prime is 666153533. The next prime is 666153559. The reversal of 666153538 is 835351666.

It is a junction number, because it is equal to n+sod(n) for n = 666153494 and 666153503.

It is not an unprimeable number, because it can be changed into a prime (666153533) 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, 277648 + ... + 280036.

It is an arithmetic number, because the mean of its divisors is an integer number (63110340).

Almost surely, 2^666153538 is an apocalyptic number.

666153538 is a deficient number, since it is larger than the sum of its proper divisors (343611902).

666153538 is a wasteful number, since it uses less digits than its factorization.

666153538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801.

The product of its digits is 388800, while the sum is 43.

The square root of 666153538 is about 25809.9503680267. The cubic root of 666153538 is about 873.3562776185.

The spelling of 666153538 in words is "six hundred sixty-six million, one hundred fifty-three thousand, five hundred thirty-eight".