669187154 has 4 divisors (see below), whose sum is σ = 1003780734. Its totient is φ = 334593576.

The previous prime is 669187109. The next prime is 669187157. The reversal of 669187154 is 451781966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 451781966 = 2 ⋅225890983.

It can be written as a sum of positive squares in only one way, i.e., 659719225 + 9467929 = 25685^2 + 3077^2 .

It is a super-2 number, since 2×669187154² = 895622894157239432, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669187099 and 669187108.

It is not an unprimeable number, because it can be changed into a prime (669187157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167296787 + ... + 167296790.

Almost surely, 2^669187154 is an apocalyptic number.

669187154 is a deficient number, since it is larger than the sum of its proper divisors (334593580).

669187154 is a wasteful number, since it uses less digits than its factorization.

669187154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334593579.

The product of its digits is 362880, while the sum is 47.

The square root of 669187154 is about 25868.6519556006. The cubic root of 669187154 is about 874.6800044583.

The spelling of 669187154 in words is "six hundred sixty-nine million, one hundred eighty-seven thousand, one hundred fifty-four".