154025438661 has 12 divisors (see below), whose sum is σ = 223346878092. Its totient is φ = 102284077056.

The previous prime is 154025438597. The next prime is 154025438689. The reversal of 154025438661 is 166834520451.

154025438661 is a `hidden beast` number, since 1 + 5 + 40 + 2 + 543 + 8 + 6 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 148094898561 + 5930540100 = 384831^2 + 77010^2 .

It is not a de Polignac number, because 154025438661 - 2⁶ = 154025438597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154025436661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33293286 + ... + 33297911.

It is an arithmetic number, because the mean of its divisors is an integer number (18612239841).

Almost surely, 2^154025438661 is an apocalyptic number.

It is an amenable number.

154025438661 is a deficient number, since it is larger than the sum of its proper divisors (69321439431).

154025438661 is a wasteful number, since it uses less digits than its factorization.

154025438661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66591460 (or 66591457 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 154025438661 in words is "one hundred fifty-four billion, twenty-five million, four hundred thirty-eight thousand, six hundred sixty-one".