155818779671 has 2 divisors, whose sum is σ = 155818779672. Its totient is φ = 155818779670.

The previous prime is 155818779667. The next prime is 155818779689. The reversal of 155818779671 is 176977818551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155818779671 - 2² = 155818779667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155818779598 and 155818779607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155818779071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77909389835 + 77909389836.

It is an arithmetic number, because the mean of its divisors is an integer number (77909389836).

Almost surely, 2^155818779671 is an apocalyptic number.

155818779671 is a deficient number, since it is larger than the sum of its proper divisors (1).

155818779671 is an equidigital number, since it uses as much as digits as its factorization.

155818779671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29635200, while the sum is 65.

The spelling of 155818779671 in words is "one hundred fifty-five billion, eight hundred eighteen million, seven hundred seventy-nine thousand, six hundred seventy-one".