155761553 has 2 divisors, whose sum is σ = 155761554. Its totient is φ = 155761552.

The previous prime is 155761549. The next prime is 155761579. The reversal of 155761553 is 355167551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153933649 + 1827904 = 12407^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 155761553 - 2² = 155761549 is a prime.

It is a super-2 number, since 2×155761553² = 48523322785943618, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155761513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77880776 + 77880777.

It is an arithmetic number, because the mean of its divisors is an integer number (77880777).

Almost surely, 2^155761553 is an apocalyptic number.

It is an amenable number.

155761553 is a deficient number, since it is larger than the sum of its proper divisors (1).

155761553 is an equidigital number, since it uses as much as digits as its factorization.

155761553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78750, while the sum is 38.

The square root of 155761553 is about 12480.4468269369. The cubic root of 155761553 is about 538.0468455130.

The spelling of 155761553 in words is "one hundred fifty-five million, seven hundred sixty-one thousand, five hundred fifty-three".