154127778461 has 2 divisors, whose sum is σ = 154127778462. Its totient is φ = 154127778460.

The previous prime is 154127778439. The next prime is 154127778523. The reversal of 154127778461 is 164877721451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114409680025 + 39718098436 = 338245^2 + 199294^2 .

It is an emirp because it is prime and its reverse (164877721451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154127778461 - 2¹⁰ = 154127777437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154127778661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77063889230 + 77063889231.

It is an arithmetic number, because the mean of its divisors is an integer number (77063889231).

Almost surely, 2^154127778461 is an apocalyptic number.

It is an amenable number.

154127778461 is a deficient number, since it is larger than the sum of its proper divisors (1).

154127778461 is an equidigital number, since it uses as much as digits as its factorization.

154127778461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2634240, while the sum is 53.

The spelling of 154127778461 in words is "one hundred fifty-four billion, one hundred twenty-seven million, seven hundred seventy-eight thousand, four hundred sixty-one".