6421161253531 has 8 divisors (see below), whose sum is σ = 6762617467200. Its totient is φ = 6080055075720.

The previous prime is 6421161253483. The next prime is 6421161253583. The reversal of 6421161253531 is 1353521611246.

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

It is a cyclic number.

It is not a de Polignac number, because 6421161253531 - 2¹³ = 6421161245339 is a prime.

It is a super-2 number, since 2×6421161253531² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421161253231) 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, 87471301 + ... + 87544678.

It is an arithmetic number, because the mean of its divisors is an integer number (845327183400).

Almost surely, 2^{6421161253531} is an apocalyptic number.

6421161253531 is a deficient number, since it is larger than the sum of its proper divisors (341456213669).

6421161253531 is a wasteful number, since it uses less digits than its factorization.

6421161253531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175017929.

The product of its digits is 129600, while the sum is 40.

Adding to 6421161253531 its reverse (1353521611246), we get a palindrome (7774682864777).

The spelling of 6421161253531 in words is "six trillion, four hundred twenty-one billion, one hundred sixty-one million, two hundred fifty-three thousand, five hundred thirty-one".