1555304120425 has 24 divisors (see below), whose sum is σ = 2106772836480. Its totient is φ = 1129586971200.

The previous prime is 1555304120423. The next prime is 1555304120431. The reversal of 1555304120425 is 5240214035551.

It is not a de Polignac number, because 1555304120425 - 2¹ = 1555304120423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1555304120423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3656305 + ... + 4059454.

It is an arithmetic number, because the mean of its divisors is an integer number (87782201520).

Almost surely, 2^{1555304120425} is an apocalyptic number.

It is an amenable number.

1555304120425 is a deficient number, since it is larger than the sum of its proper divisors (551468716055).

1555304120425 is a wasteful number, since it uses less digits than its factorization.

1555304120425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7716513 (or 7716508 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

Adding to 1555304120425 its reverse (5240214035551), we get a palindrome (6795518155976).

The spelling of 1555304120425 in words is "one trillion, five hundred fifty-five billion, three hundred four million, one hundred twenty thousand, four hundred twenty-five".