155403553 has 2 divisors, whose sum is σ = 155403554. Its totient is φ = 155403552.

The previous prime is 155403541. The next prime is 155403623. The reversal of 155403553 is 355304551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153586449 + 1817104 = 12393^2 + 1348^2 .

It is a cyclic number.

It is not a de Polignac number, because 155403553 - 2⁹ = 155403041 is a prime.

It is not a weakly prime, because it can be changed into another prime (155403503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77701776 + 77701777.

It is an arithmetic number, because the mean of its divisors is an integer number (77701777).

Almost surely, 2^155403553 is an apocalyptic number.

It is an amenable number.

155403553 is a deficient number, since it is larger than the sum of its proper divisors (1).

155403553 is an equidigital number, since it uses as much as digits as its factorization.

155403553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 31.

The square root of 155403553 is about 12466.0961411342. The cubic root of 155403553 is about 537.6343163877.

The spelling of 155403553 in words is "one hundred fifty-five million, four hundred three thousand, five hundred fifty-three".