61006005551 has 2 divisors, whose sum is σ = 61006005552. Its totient is φ = 61006005550.

The previous prime is 61006005523. The next prime is 61006005583. The reversal of 61006005551 is 15550060016.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61006005551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61006205551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30503002775 + 30503002776.

It is an arithmetic number, because the mean of its divisors is an integer number (30503002776).

Almost surely, 2^61006005551 is an apocalyptic number.

61006005551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61006005551 is an equidigital number, since it uses as much as digits as its factorization.

61006005551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

Adding to 61006005551 its reverse (15550060016), we get a palindrome (76556065567).

The spelling of 61006005551 in words is "sixty-one billion, six million, five thousand, five hundred fifty-one".