3551547642521 has 2 divisors, whose sum is σ = 3551547642522. Its totient is φ = 3551547642520.

The previous prime is 3551547642457. The next prime is 3551547642547. The reversal of 3551547642521 is 1252467451553.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2905453202521 + 646094440000 = 1704539^2 + 803800^2 .

It is an emirp because it is prime and its reverse (1252467451553) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3551547642521 - 2⁶ = 3551547642457 is a prime.

It is a super-2 number, since 2×3551547642521² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3551547642521.

It is not a weakly prime, because it can be changed into another prime (3551547642821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775773821260 + 1775773821261.

It is an arithmetic number, because the mean of its divisors is an integer number (1775773821261).

Almost surely, 2^{3551547642521} is an apocalyptic number.

It is an amenable number.

3551547642521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3551547642521 is an equidigital number, since it uses as much as digits as its factorization.

3551547642521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040000, while the sum is 50.

The spelling of 3551547642521 in words is "three trillion, five hundred fifty-one billion, five hundred forty-seven million, six hundred forty-two thousand, five hundred twenty-one".