154644940557 has 20 divisors (see below), whose sum is σ = 231099111936. Its totient is φ = 103058113320.

The previous prime is 154644940523. The next prime is 154644940573. The reversal of 154644940557 is 755049446451.

154644940557 is a `hidden beast` number, since 1 + 5 + 4 + 6 + 4 + 49 + 40 + 557 = 666.

It is not a de Polignac number, because 154644940557 - 2¹² = 154644936461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154644940517) 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, 137619 + ... + 572912.

Almost surely, 2^154644940557 is an apocalyptic number.

It is an amenable number.

154644940557 is a deficient number, since it is larger than the sum of its proper divisors (76454171379).

154644940557 is an equidigital number, since it uses as much as digits as its factorization.

154644940557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713230 (or 713221 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 54.

The spelling of 154644940557 in words is "one hundred fifty-four billion, six hundred forty-four million, nine hundred forty thousand, five hundred fifty-seven".