55551566511 has 36 divisors (see below), whose sum is σ = 96560451000. Its totient is φ = 30649133088.

The previous prime is 55551566501. The next prime is 55551566549. The reversal of 55551566511 is 11566515555.

It is not a de Polignac number, because 55551566511 - 2⁹ = 55551565999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551566501) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2159061 + ... + 2184638.

It is an arithmetic number, because the mean of its divisors is an integer number (2682234750).

Almost surely, 2^55551566511 is an apocalyptic number.

55551566511 is a deficient number, since it is larger than the sum of its proper divisors (41008884489).

55551566511 is a wasteful number, since it uses less digits than its factorization.

55551566511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4343748 (or 4343738 counting only the distinct ones).

The product of its digits is 562500, while the sum is 45.

The spelling of 55551566511 in words is "fifty-five billion, five hundred fifty-one million, five hundred sixty-six thousand, five hundred eleven".