1555423641 has 20 divisors (see below), whose sum is σ = 2324936592. Its totient is φ = 1036323288.

The previous prime is 1555423637. The next prime is 1555423651. The reversal of 1555423641 is 1463245551.

1555423641 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 4 + 2 + 3 + 641 = 666.

It is not a de Polignac number, because 1555423641 - 2² = 1555423637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1555423596 and 1555423605.

It is not an unprimeable number, because it can be changed into a prime (1555423631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 157450 + ... + 167036.

Almost surely, 2^1555423641 is an apocalyptic number.

It is an amenable number.

1555423641 is a deficient number, since it is larger than the sum of its proper divisors (769512951).

1555423641 is an equidigital number, since it uses as much as digits as its factorization.

1555423641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11602 (or 11593 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 1555423641 is about 39438.8595296568. The cubic root of 1555423641 is about 1158.6427946189.

The spelling of 1555423641 in words is "one billion, five hundred fifty-five million, four hundred twenty-three thousand, six hundred forty-one".