155387421863 has 2 divisors, whose sum is σ = 155387421864. Its totient is φ = 155387421862.

The previous prime is 155387421853. The next prime is 155387421881. The reversal of 155387421863 is 368124783551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155387421863 - 2²⁴ = 155370644647 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155387421823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77693710931 + 77693710932.

It is an arithmetic number, because the mean of its divisors is an integer number (77693710932).

Almost surely, 2^155387421863 is an apocalyptic number.

155387421863 is a deficient number, since it is larger than the sum of its proper divisors (1).

155387421863 is an equidigital number, since it uses as much as digits as its factorization.

155387421863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4838400, while the sum is 53.

The spelling of 155387421863 in words is "one hundred fifty-five billion, three hundred eighty-seven million, four hundred twenty-one thousand, eight hundred sixty-three".