154440042641 has 4 divisors (see below), whose sum is σ = 154773606912. Its totient is φ = 154106478372.

The previous prime is 154440042637. The next prime is 154440042661. The reversal of 154440042641 is 146240044451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146240044451 = 127 ⋅1151496413.

It is a cyclic number.

It is not a de Polignac number, because 154440042641 - 2² = 154440042637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154440042661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166781441 + ... + 166782366.

It is an arithmetic number, because the mean of its divisors is an integer number (38693401728).

Almost surely, 2^154440042641 is an apocalyptic number.

It is an amenable number.

154440042641 is a deficient number, since it is larger than the sum of its proper divisors (333564271).

154440042641 is an equidigital number, since it uses as much as digits as its factorization.

154440042641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333564270.

The product of its (nonzero) digits is 61440, while the sum is 35.

The spelling of 154440042641 in words is "one hundred fifty-four billion, four hundred forty million, forty-two thousand, six hundred forty-one".