666961762 has 4 divisors (see below), whose sum is σ = 1000442646. Its totient is φ = 333480880.

The previous prime is 666961759. The next prime is 666961781. The reversal of 666961762 is 267169666.

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., 546203641 + 120758121 = 23371^2 + 10989^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166740439 + ... + 166740442.

Almost surely, 2^666961762 is an apocalyptic number.

666961762 is a deficient number, since it is larger than the sum of its proper divisors (333480884).

666961762 is a wasteful number, since it uses less digits than its factorization.

666961762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333480883.

The product of its digits is 979776, while the sum is 49.

The square root of 666961762 is about 25825.6028390433. The cubic root of 666961762 is about 873.7093404821.

The spelling of 666961762 in words is "six hundred sixty-six million, nine hundred sixty-one thousand, seven hundred sixty-two".