5551806691 has 2 divisors, whose sum is σ = 5551806692. Its totient is φ = 5551806690.

The previous prime is 5551806649. The next prime is 5551806751. The reversal of 5551806691 is 1966081555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5551806691 - 2⁷ = 5551806563 is a prime.

It is not a weakly prime, because it can be changed into another prime (5551806641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2775903345 + 2775903346.

It is an arithmetic number, because the mean of its divisors is an integer number (2775903346).

Almost surely, 2^5551806691 is an apocalyptic number.

5551806691 is a deficient number, since it is larger than the sum of its proper divisors (1).

5551806691 is an equidigital number, since it uses as much as digits as its factorization.

5551806691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 46.

The square root of 5551806691 is about 74510.4468581420. The cubic root of 5551806691 is about 1770.6991493587.

The spelling of 5551806691 in words is "five billion, five hundred fifty-one million, eight hundred six thousand, six hundred ninety-one".