1318905125550 has 36 divisors (see below), whose sum is σ = 3543458438520. Its totient is φ = 351708033360.

The previous prime is 1318905125521. The next prime is 1318905125597. The reversal of 1318905125550 is 555215098131.

1318905125550 is a `hidden beast` number, since 1 + 3 + 1 + 8 + 90 + 5 + 1 + 2 + 5 + 550 = 666.

It is a super-2 number, since 2×1318905125550² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1318905125496 and 1318905125505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1465449690 + ... + 1465450589.

It is an arithmetic number, because the mean of its divisors is an integer number (98429401070).

Almost surely, 2^{1318905125550} is an apocalyptic number.

1318905125550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1318905125550 is an abundant number, since it is smaller than the sum of its proper divisors (2224553312970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1318905125550 is a wasteful number, since it uses less digits than its factorization.

1318905125550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930900297 (or 2930900289 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 45.

The spelling of 1318905125550 in words is "one trillion, three hundred eighteen billion, nine hundred five million, one hundred twenty-five thousand, five hundred fifty".