15451541561 has 2 divisors, whose sum is σ = 15451541562. Its totient is φ = 15451541560.

The previous prime is 15451541549. The next prime is 15451541563. The reversal of 15451541561 is 16514515451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9502350400 + 5949191161 = 97480^2 + 77131^2 .

It is a cyclic number.

It is not a de Polignac number, because 15451541561 - 2²² = 15447347257 is a prime.

It is a super-2 number, since 2×15451541561² (a number of 21 digits) contains 22 as substring.

Together with 15451541563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15451541563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7725770780 + 7725770781.

It is an arithmetic number, because the mean of its divisors is an integer number (7725770781).

Almost surely, 2^15451541561 is an apocalyptic number.

It is an amenable number.

15451541561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15451541561 is an equidigital number, since it uses as much as digits as its factorization.

15451541561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60000, while the sum is 38.

The spelling of 15451541561 in words is "fifteen billion, four hundred fifty-one million, five hundred forty-one thousand, five hundred sixty-one".