155115003991 has 2 divisors, whose sum is σ = 155115003992. Its totient is φ = 155115003990.

The previous prime is 155115003913. The next prime is 155115004013. The reversal of 155115003991 is 199300511551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155115003991 - 2⁷ = 155115003863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155115003391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77557501995 + 77557501996.

It is an arithmetic number, because the mean of its divisors is an integer number (77557501996).

Almost surely, 2^155115003991 is an apocalyptic number.

155115003991 is a deficient number, since it is larger than the sum of its proper divisors (1).

155115003991 is an equidigital number, since it uses as much as digits as its factorization.

155115003991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30375, while the sum is 40.

The spelling of 155115003991 in words is "one hundred fifty-five billion, one hundred fifteen million, three thousand, nine hundred ninety-one".