55611690991 has 2 divisors, whose sum is σ = 55611690992. Its totient is φ = 55611690990.

The previous prime is 55611690973. The next prime is 55611691139. The reversal of 55611690991 is 19909611655.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55611690991 - 2¹⁷ = 55611559919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55611690971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27805845495 + 27805845496.

It is an arithmetic number, because the mean of its divisors is an integer number (27805845496).

Almost surely, 2^55611690991 is an apocalyptic number.

55611690991 is a deficient number, since it is larger than the sum of its proper divisors (1).

55611690991 is an equidigital number, since it uses as much as digits as its factorization.

55611690991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 656100, while the sum is 52.

The spelling of 55611690991 in words is "fifty-five billion, six hundred eleven million, six hundred ninety thousand, nine hundred ninety-one".