154661666247 has 20 divisors (see below), whose sum is σ = 252041235336. Its totient is φ = 93734342640.

The previous prime is 154661666239. The next prime is 154661666261. The reversal of 154661666247 is 742666166451.

It is not a de Polignac number, because 154661666247 - 2³ = 154661666239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 154661666193 and 154661666202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154661666267) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 86790168 + ... + 86791949.

Almost surely, 2^154661666247 is an apocalyptic number.

154661666247 is a deficient number, since it is larger than the sum of its proper divisors (97379569089).

154661666247 is a wasteful number, since it uses less digits than its factorization.

154661666247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173582140 (or 173582131 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 154661666247 in words is "one hundred fifty-four billion, six hundred sixty-one million, six hundred sixty-six thousand, two hundred forty-seven".