154878661 has 12 divisors (see below), whose sum is σ = 180377868. Its totient is φ = 132596352.

The previous prime is 154878649. The next prime is 154878673. The reversal of 154878661 is 166878451.

It is an interprime number because it is at equal distance from previous prime (154878649) and next prime (154878673).

It can be written as a sum of positive squares in 2 ways, for example, as 151437636 + 3441025 = 12306^2 + 1855^2 .

It is not a de Polignac number, because 154878661 - 2⁷ = 154878533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154878641) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 62335 + ... + 64771.

It is an arithmetic number, because the mean of its divisors is an integer number (15031489).

Almost surely, 2^154878661 is an apocalyptic number.

It is an amenable number.

154878661 is a deficient number, since it is larger than the sum of its proper divisors (25499207).

154878661 is a wasteful number, since it uses less digits than its factorization.

154878661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748 (or 3741 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 154878661 is about 12445.0255524045. The cubic root of 154878661 is about 537.0283279493.

The spelling of 154878661 in words is "one hundred fifty-four million, eight hundred seventy-eight thousand, six hundred sixty-one".