1555402424321 has 8 divisors (see below), whose sum is σ = 1556283165120. Its totient is φ = 1554521812272.

The previous prime is 1555402424311. The next prime is 1555402424413. The reversal of 1555402424321 is 1234242045551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555402424321 is a prime.

It is a super-2 number, since 2×1555402424321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555402424311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33832076 + ... + 33878018.

It is an arithmetic number, because the mean of its divisors is an integer number (194535395640).

Almost surely, 2^{1555402424321} is an apocalyptic number.

It is an amenable number.

1555402424321 is a deficient number, since it is larger than the sum of its proper divisors (880740799).

1555402424321 is a wasteful number, since it uses less digits than its factorization.

1555402424321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64375.

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 1555402424321 its reverse (1234242045551), we get a palindrome (2789644469872).

The spelling of 1555402424321 in words is "one trillion, five hundred fifty-five billion, four hundred two million, four hundred twenty-four thousand, three hundred twenty-one".