155880643 has 2 divisors, whose sum is σ = 155880644. Its totient is φ = 155880642.

The previous prime is 155880631. The next prime is 155880653. The reversal of 155880643 is 346088551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155880643 - 2¹⁷ = 155749571 is a prime.

It is equal to p_8756266 and since 155880643 and 8756266 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 155880596 and 155880605.

It is not a weakly prime, because it can be changed into another prime (155880653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77940321 + 77940322.

It is an arithmetic number, because the mean of its divisors is an integer number (77940322).

Almost surely, 2^155880643 is an apocalyptic number.

155880643 is a deficient number, since it is larger than the sum of its proper divisors (1).

155880643 is an equidigital number, since it uses as much as digits as its factorization.

155880643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 155880643 is about 12485.2169784910. The cubic root of 155880643 is about 538.1839347035.

The spelling of 155880643 in words is "one hundred fifty-five million, eight hundred eighty thousand, six hundred forty-three".