155953643 has 2 divisors, whose sum is σ = 155953644. Its totient is φ = 155953642.

The previous prime is 155953621. The next prime is 155953667. The reversal of 155953643 is 346359551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155953643 - 2¹⁰ = 155952619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155953643.

It is not a weakly prime, because it can be changed into another prime (155953243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77976821 + 77976822.

It is an arithmetic number, because the mean of its divisors is an integer number (77976822).

Almost surely, 2^155953643 is an apocalyptic number.

155953643 is a deficient number, since it is larger than the sum of its proper divisors (1).

155953643 is an equidigital number, since it uses as much as digits as its factorization.

155953643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243000, while the sum is 41.

The square root of 155953643 is about 12488.1400937049. The cubic root of 155953643 is about 538.2679333647.

The spelling of 155953643 in words is "one hundred fifty-five million, nine hundred fifty-three thousand, six hundred forty-three".