3551509645421 has 4 divisors (see below), whose sum is σ = 3562239282144. Its totient is φ = 3540780008700.

The previous prime is 3551509645391. The next prime is 3551509645429. The reversal of 3551509645421 is 1245469051553.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3551509645421 - 2⁶ = 3551509645357 is a prime.

It is a super-2 number, since 2×3551509645421² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3551509645421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3551509645429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5364817865 + ... + 5364818526.

It is an arithmetic number, because the mean of its divisors is an integer number (890559820536).

Almost surely, 2^{3551509645421} is an apocalyptic number.

It is an amenable number.

3551509645421 is a deficient number, since it is larger than the sum of its proper divisors (10729636723).

3551509645421 is a wasteful number, since it uses less digits than its factorization.

3551509645421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10729636722.

The product of its (nonzero) digits is 3240000, while the sum is 50.

The spelling of 3551509645421 in words is "three trillion, five hundred fifty-one billion, five hundred nine million, six hundred forty-five thousand, four hundred twenty-one".