1555513215345 has 96 divisors (see below), whose sum is σ = 2750662946304. Its totient is φ = 812965248000.

The previous prime is 1555513215271. The next prime is 1555513215407. The reversal of 1555513215345 is 5435123155551.

1555513215345 is a `hidden beast` number, since 1 + 5 + 5 + 551 + 3 + 2 + 1 + 53 + 45 = 666.

It is not a de Polignac number, because 1555513215345 - 2⁹ = 1555513214833 is a prime.

It is a super-2 number, since 2×1555513215345² (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 Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1555513215345.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1463323284 + ... + 1463324346.

It is an arithmetic number, because the mean of its divisors is an integer number (28652739024).

Almost surely, 2^{1555513215345} is an apocalyptic number.

1555513215345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1555513215345 is a deficient number, since it is larger than the sum of its proper divisors (1195149730959).

1555513215345 is a wasteful number, since it uses less digits than its factorization.

1555513215345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623 (or 2620 counting only the distinct ones).

The product of its digits is 1125000, while the sum is 45.

It can be divided in two parts, 155551 and 3215345, that added together give a square (3370896 = 1836²).

The spelling of 1555513215345 in words is "one trillion, five hundred fifty-five billion, five hundred thirteen million, two hundred fifteen thousand, three hundred forty-five".