5551061100561 has 12 divisors (see below), whose sum is σ = 8027756231040. Its totient is φ = 3696296540280.

The previous prime is 5551061100547. The next prime is 5551061100617. The reversal of 5551061100561 is 1650011601555.

It is a happy number.

It is not a de Polignac number, because 5551061100561 - 2⁷ = 5551061100433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5551061100961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 367563705 + ... + 367578806.

It is an arithmetic number, because the mean of its divisors is an integer number (668979685920).

Almost surely, 2^{5551061100561} is an apocalyptic number.

It is an amenable number.

5551061100561 is a deficient number, since it is larger than the sum of its proper divisors (2476695130479).

5551061100561 is a wasteful number, since it uses less digits than its factorization.

5551061100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735143356 (or 735143353 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 5551061100561 in words is "five trillion, five hundred fifty-one billion, sixty-one million, one hundred thousand, five hundred sixty-one".