55213042987 has 2 divisors, whose sum is σ = 55213042988. Its totient is φ = 55213042986.

The previous prime is 55213042967. The next prime is 55213043069. The reversal of 55213042987 is 78924031255.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55213042987 is a prime.

It is not a weakly prime, because it can be changed into another prime (55213042967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27606521493 + 27606521494.

It is an arithmetic number, because the mean of its divisors is an integer number (27606521494).

Almost surely, 2^55213042987 is an apocalyptic number.

55213042987 is a deficient number, since it is larger than the sum of its proper divisors (1).

55213042987 is an equidigital number, since it uses as much as digits as its factorization.

55213042987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 55213042987 in words is "fifty-five billion, two hundred thirteen million, forty-two thousand, nine hundred eighty-seven".