155643606919 has 2 divisors, whose sum is σ = 155643606920. Its totient is φ = 155643606918.

The previous prime is 155643606917. The next prime is 155643606949. The reversal of 155643606919 is 919606346551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155643606919 - 2¹ = 155643606917 is a prime.

It is a super-2 number, since 2×155643606919² (a number of 23 digits) contains 22 as substring.

Together with 155643606917, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 155643606919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155643606917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77821803459 + 77821803460.

It is an arithmetic number, because the mean of its divisors is an integer number (77821803460).

Almost surely, 2^155643606919 is an apocalyptic number.

155643606919 is a deficient number, since it is larger than the sum of its proper divisors (1).

155643606919 is an equidigital number, since it uses as much as digits as its factorization.

155643606919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5248800, while the sum is 55.

The spelling of 155643606919 in words is "one hundred fifty-five billion, six hundred forty-three million, six hundred six thousand, nine hundred nineteen".