1551243542004 has 144 divisors (see below), whose sum is σ = 4236998875200. Its totient is φ = 475706068992.

The previous prime is 1551243542003. The next prime is 1551243542021. The reversal of 1551243542004 is 4002453421551.

1551243542004 is a `hidden beast` number, since 1 + 5 + 5 + 12 + 435 + 4 + 200 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1551243542004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551243542003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 374784967 + ... + 374789105.

It is an arithmetic number, because the mean of its divisors is an integer number (29423603300).

Almost surely, 2^{1551243542004} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551243542004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2118499437600).

1551243542004 is an abundant number, since it is smaller than the sum of its proper divisors (2685755333196).

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

1551243542004 is a wasteful number, since it uses less digits than its factorization.

1551243542004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6654 (or 6649 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 1551243542004 its reverse (4002453421551), we get a palindrome (5553696963555).

The spelling of 1551243542004 in words is "one trillion, five hundred fifty-one billion, two hundred forty-three million, five hundred forty-two thousand, four".