154921923887 has 2 divisors, whose sum is σ = 154921923888. Its totient is φ = 154921923886.

The previous prime is 154921923857. The next prime is 154921923941. The reversal of 154921923887 is 788329129451.

It is a weak prime.

It is an emirp because it is prime and its reverse (788329129451) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154921923887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154921923847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77460961943 + 77460961944.

It is an arithmetic number, because the mean of its divisors is an integer number (77460961944).

Almost surely, 2^154921923887 is an apocalyptic number.

154921923887 is a deficient number, since it is larger than the sum of its proper divisors (1).

154921923887 is an equidigital number, since it uses as much as digits as its factorization.

154921923887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 59.

The spelling of 154921923887 in words is "one hundred fifty-four billion, nine hundred twenty-one million, nine hundred twenty-three thousand, eight hundred eighty-seven".