666151274 has 4 divisors (see below), whose sum is σ = 999226914. Its totient is φ = 333075636.

The previous prime is 666151271. The next prime is 666151279. The reversal of 666151274 is 472151666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 652036225 + 14115049 = 25535^2 + 3757^2 .

It is not an unprimeable number, because it can be changed into a prime (666151271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166537817 + ... + 166537820.

Almost surely, 2^666151274 is an apocalyptic number.

666151274 is a deficient number, since it is larger than the sum of its proper divisors (333075640).

666151274 is a wasteful number, since it uses less digits than its factorization.

666151274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333075639.

The product of its digits is 60480, while the sum is 38.

The square root of 666151274 is about 25809.9065089357. The cubic root of 666151274 is about 873.3552882165.

The spelling of 666151274 in words is "six hundred sixty-six million, one hundred fifty-one thousand, two hundred seventy-four".