155404540831 has 2 divisors, whose sum is σ = 155404540832. Its totient is φ = 155404540830.

The previous prime is 155404540829. The next prime is 155404540867. The reversal of 155404540831 is 138045404551.

It is a weak prime.

It is an emirp because it is prime and its reverse (138045404551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155404540831 - 2¹ = 155404540829 is a prime.

It is a super-2 number, since 2×155404540831² (a number of 23 digits) contains 22 as substring.

Together with 155404540829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155404540891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77702270415 + 77702270416.

It is an arithmetic number, because the mean of its divisors is an integer number (77702270416).

Almost surely, 2^155404540831 is an apocalyptic number.

155404540831 is a deficient number, since it is larger than the sum of its proper divisors (1).

155404540831 is an equidigital number, since it uses as much as digits as its factorization.

155404540831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 155404540831 in words is "one hundred fifty-five billion, four hundred four million, five hundred forty thousand, eight hundred thirty-one".